TCNCYH phu trWdng 71 (6) - 2010 discourses of vital registration and personhood: perspectives from rural South Africa, Social Science Medicine, 46, 043 - 56 Mungala, V and Snow, R (1994) Death registration on the Kenyan coast, East African Medical Journal, , 747 - 750 Kane, P and Choi, C Y (1999) China's once child family policy, BMJ, 319, 992 - 994 Prasarkul, P and Vapattznawong, P (2006) of death Thailand: Evidence from Laopaiboon, M., Pothlnam, S and Patlthat, N Surveillance System Kanehanaburi (1990) Why are Thai official perinatal and infant W ° ' ' ' ^ health & Population, - Lumbiganon, P., Panamonta, The M., mortality rates so low? International Journal of Epidemiology, , 9 - 1000 completeness of registration in Demographic Project, ">'S '•- WB (2001) Vietnam Growing Healthy: A Review of Vietnam' Health Sector, World Bank, M e r l l , G M (1988) Underreporting of births Hanoi, - and infant deaths in rural China: evidence from field research in one county of Northern China, The China Quarterly, September 55, 637 - 652 10 YI, Z (1996) Is Fertility in China in 1991 92 Far Below Replacement Level?, Population Studies, 50, 27 - 34 Summary VALIDITY OF DEATH REPORTING AND REGISTRATION OF ROUTINE SYSTEM IN BAVI DISTRICT, HATAY PROVINCE Objectives: To examine the validity of mortality estimates collected by different methods within the study site Method: The study was completed by comparing deaths detected and registered by different methods Results: Out ef 471 deaths detected by all methcds in 1999 and 2000, the FilaBavi quarterly household follow - ups detected 470 deaths (99.8%) The Commune Population Registry System missed 89 cases (18.9%), the majority being infants deaths The FilaBavi re - census survey missed 19 deaths (4%), and the neighbourhood survey, where groups of local people listed deaths, over - reported deaths Conclusions: Mortality estimates based on information from routine systems at the commune level have low validity FilaBavi performed better than any of these official systems Keywords: Mortality validity, vital events registration, Vietnam TY SO GlOfI KHI SINH QUA DIEU TRA THEO DOI DOC TAI HUYEN BA VI TL/ 2000 - 2009 Nguyin Dffe H l n h \ Tran Khanh T o a n \ Nguyen Hoang Long^ 'Trudng Dai hoc Y Ha Ndi; -Bd Y te Trong nhdng nam gan diy, ty sd gidi tinh sinh (SRB) d Viet Nam dang trd nen mat cin b'ang Muc tieu: md ta thdc trang va xu hudng thay doi SRB cung mot sd yeu td lien quan tai huyen Ba VI td 2000 2009 Ddi tuang va phuang phap nghien ciifu: thdng tin cua 8608 tre sinh sdng duac ghi nhin qua dieu tra phone van ho gia dinh hang quy tai ca sd thdc dia dich ti hoc FilaBavi td 2000 - 2009 Ket qua: SRB trung binh 10 nam la 114,6 (dao ddng td 104,8 - 129,4), cao han nhieu so vdi mde cin bang sinh hoc va 93 TCNCYH phu trWdng 71 (6) - 2010 dang cd xu hddng tang SRB dddng nhd cao han d nhdng ba me tren 35 tuoi, cd trlnh dp hoc van cao, lam vi$c linh vdc phi ndng nghiep Ty so tang theo thd td sinh, nhat la thd trd len (120,9) va trddc chda cd trai (122,9) Ket luan: sd mi't can bang SRB d Ba Vi dang d mde ding bao ddng Can phai cd mdt nghien cdu sau han vS SRB lien quan de'n hanh vi Ida chon gidi tinh, tren mot pham vi rdng han Tff khoa: Ty sd gidi sinh; khu vffc nong thon LDATVANDE Ty sd gidi sinh la mpt nhflng ehi sd phan anh sfl can bang ve gidi eua eau true dan sd, difdc x l c dinh bang sd tre nam difpe sinh tren 100 tre nfl Ty sd tifdng ddi dn djnh vdi mfle ehuan sinh hpe la 104 - 106/100 [2] Mat can bang ve gidi tinh sinh se pha vd tfnh b i n vflng eua c l u true dan sd va gay nen nhflng he luy v l mat xa hpi khdng chi trifdc mat va ca tifdng lai Tam ly chuong trai, chinh sleh han che mde sinh II DOI TUONG vA PHUONG PHAP NGHIEN cOu Thie't ke va dia ban nghien cffu Nghien cflu theo doi dpc dfldc thflc hien tai co sd thflc dia dich t l hpe FilaBavi, huyen Ba Vi, ngoai Ha Npi, tren mpt quan the gom 11089 hd gia dinh vdi 51024 dan sinh sdng dfldc theo ddi, cap nhat d c thdng tin v l nhan khau va sdc khde thdng qua phdng van hp gia dinh thang/lan[5] eung vdi kha nang p h l t hien gidi tinh qua sieu am va de dang tiep can vdi eae dich vu nao p h i thai la nhflng nguyen nhan cd b i n d i n den tinh trang mat Dd^l tOdng nghien cffu va ky thuat thu thap thong tin can bang gidi tinh dang trd nen ngay sau sac Dd'i tfldng cua nghien cflu la toan bp 8608 tre d n h i l u nflde chau A nhif Han Qudc, Trung Qudc sinh sd'ng dflpe phat hien va dang ky quan ly tai va An Dp [2, 3, 6] nflde ta, n h i l u b i o d o d i l u cd sd thflc dia FilaBavi vdng 10 nam tO 2000 tra nghien cflu gan day da eho tha'y tinh trang mat - 2009 thdng qua phdng v i n hd gia dinh theo can bang gidi tinh sinh dang d mde dang b i o djnh ky hang quy Thdng tin ca nhan cua tre dpng ddi hdi phai ed nhflng bien phap can thiep (ngay t h i n g nam sinh, gidi, eon thd may gia kjp thdi 11, , ] dinh) va eua ba me (tudi, n g h i nghiep, trinh van hda, tinh trang hdn nhan) difpc thu thap, cap Cae nghien cflu v l va'n d l gidi tinh sinh d Viet Nam chu ye'u dfla vao cac eupc d i l u tra cat ngang ve dan sd hoac dfla vao so lieu b i o d o cua nhat dfla tren bang hdi sau dd dope nhap va lUu gifl he thd'ng cP sd dfl lieu chung cua cd s6 thflc dja FilaBavi tdng cue tho'ng ke Dupe tien hanh tren cd m l u Idn, cac nghien cflu cho phep dfla fldc XO ly sdlleu doan chfnh xac v l ty sua't gidi sinh d cap qudc Thdng tin phuc vu eho nghien eflu dUdc gia nhflng khdng p h i n anh dUdc thflc te' vd'n rat trich xua't tfl ep sd dfl lieu cua FilaBavi tren khac d cae dia phfldng [2] Chung tdi t i l n phan mem Access va dflde xfl ly bang phan hanh nghien cdu tai co sd thflc dja FilaBavi, mem Stata phien b i n 11.0 Kiem djnh x" va mo huyen Ba Vi, Ha Tay eu nham muc tieu: Mo ta hinh xae suat logit dflde sd dung de kiem dinh thgc trang va xu hddng thay ddi ty sd gidi xae sua't sinh ecn trai va md'i lien quan eua ty sinh theo thdi gian va tim hieu mdi lien quan vdi sd gidi sinh vdi mpt sd ye'u t d kinh te xa mgt sd yeu td kinh te xa hoi cua ba me tai hpi Ke't qua nghien eflu difdc trinh bay difdi huyen Ba Vi giai doan 2000 - 2009 dang d e bang, bieu 94 TCNCYH phu trWdng 71 (6) - 2010 III KET QUA nam 2009 Mae du ty sd gidi sinh dao dpng Ty sd gidi sinh tfnh ehung cho d giai doan song van theo xu hfldng tang va tfl nam 2003 trd 2000 - 2009 la 114,6; tfl mfle tha'p nhat la 104,8 ve sau, ludn eao hdn mde sinh hpe binh thOdng vao nam 2000 len mfle 129,4 nam 2005 va 128,4 (bieu 1) 129.4 130 Ty so gidi 125 128.4 127.1 Muc can bane 120 115 110.2 ](M 110 12.0 111.7 109.5 Q 106.5 104.8 105 100 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Bieu Xu hudng thay ddi ty sd gidi sinh qua cac nam Bang cho thiy ty sd gidi tinh sinh cao hdn d nhCfng ba me thudc nhdm tren 35 tudi; cd trlnh hoc vin td trung hoc phd thdng trd len hoac lam viec iTnh vdc phi ndng nghiep Ty sd gidi sinh tang tuan td theo sd lin sinh, nhat la d nhdng trifdng hdp thd trd len, va cao han d nhdng trifdng hap chda cd trai trddc dd Tuy nhien nhdng khac biet chifa cd y nghTa thdng ke Bang Ty sd gidi tinh sinh theo thong tin ca nhan ciia me Nam Nff Ty sd gidi 144 117 123,1 4056 3592 112,9 396 303 130,7 < Tieu hoe 436 356 113,1 THCS 2782 2485 112,0 THPT 875 751 115,4 500 410 122,0 Lam rupng 2754 2503 110,0 Khae 1281 1064 120,4 Con thd nhat 2015 1790 112,6 Con thd hai 1738 1525 114,0 Con thfl ba 843 697 120,9 Da cd eon trai 345 295 118,3 Chfla cd trai 494 402 122,9 35 Flpc v i n eua me >THPT Nghi nghiep me Thd tfl sinh 95 TCNCYH phu trWdng 71 (6) - 2010 Mac du vin cd sd bien thien theo thdi gian nhdng xu hifdng tang ty sd gidi sinh van rd nhat doi vdi nhCfng trddng hap thd trd len, dac biet nam gin day nhit 170 T6-2,9 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Nam Bieu Ty sd gidi tinh sinh theo thii tU sinh qua cac nam dan to nam 2000, dat dinh vao nam 2006 va giam IV BAN LUAN Nghien cdu cua chdng tdi dUpc thflc hien dfla tren so' lieu theo ddi dpc cua mpt cd sd thflc dja nen cd dp tin cay eao So lieu cua nam 1999 xudng nam 2007, mudn hpn nam so v6i nghien cdu cua ehdng tdi vi d i l u tra cua Tdng cue thdng ke sd dung sd lieu sinh cua nam trUdc [1,4] khdng dupe dfla vao nghien cflu vi trpng Mae du cd m l u nhd song nghien cflu eung da nam dd, viee theo ddi sfl kien sinh ehi difpc bat dUa dUde mdt v i i gpi y ve mdi lien quan eua ty dau to quy II Hdn nfla n h i l u tac gia cho rang ty sd gidi sinh vdi mpt sd dac diem kinh te xa hpi so' gidi tfnh sinh d Viet Nam chi mdi bat dau eua ngfldi me TifPng tfl nhfl nghien cflu cua Chris- tang tfl nam 2000 [2, 4) Vdi sd Ifldng t r i dfldc ghi tophe, ty sd gidi sinh cao hon mfle trung binh nhan la 8608, chUa du de thflc hien cac phan nhflng ba me tre tudi, cd hpe van thap (tieu hoc trd tich chuyen sau song eung da tidp can cd m l u td'i xud'ng) [4], song trong nghien cdu nay, ty le thieu de cd the cho phep dUa Udc doan tUdng gidi tfnh sinh cao nhat nhdm ba me Idn dd'i chfnh xac ve ty so' gidi sinh [2] tudi (> 35 tudi) hoae ed trinh dp van hda cao hdn K i t q u i nghien cflu cho tha'y cd sfl dao (tdt nghiep trung hoc cd sd trd len) Khac biet dpng kha ldn giOa cac nam song ty so gidi ed the khac biet ed ca'u tudi va nghe sinh dang d mfle eao va vdi xu hfldng tang la ehu nghiep cua ddi tfldng hai nghien cdu kit hdp dao Ty so' gidi tinh ehung eho d vdi sfl bien thien Idn eua ty sd gidi sinh giai doan cung nhu rieng eho tflng nam (trO nam 2000) deu cao Ty sd gidi sinh eao d nhflng ba me ldn tuoi hdn mfle sinh hpe binh thfldng (104 - 106) Tuy cung phu hdp vdi sfl gia tang ty sd gidi theo thd tif mde dp bien thien cd Idn hdn song xu hfldng thay sinh nghien cdU nay, dat mfle eao nhat d lan ddi ty sdgidi sinh nghien cflu eua ehdng sinh thfl ba trd len, nha't la nhOng ngOdi chfla d tdi kha tuong ddng vdi sd lieu d i l u tra eua Tdng trai trflde dd D i l u ngUde lai vdi nghien edu cfia cue thdng ke the hien mpt sd nghien cdu tac gia Christophe [4] va tac gia Mathews [7], nhifng g i n day Theo dd, ty so' gidi sinh eung tang 96 lai tfldng ddng vdi k i t luan tO bao cao nghien cuU TCNCYH phu trWdng 71 (6) - 2010 eua UNPFA nam 2009 [2] D i l u eung ham y ed UNFPA (2009) Nhflng b i l n ddi gan day v l the cd mdi lien quan cua ty sd gidi sinh vdi ap ty sd gidi sinh d Viet Nam - Tdng quan d c life phai sinh eon trai d nhflng ba me chi ed gai b i n g chflng Ha Npi, t h i n g 8/2009 va vdi hanh vi lua chpn gidi tfnh trUdc sinh vdn da kha phd bien d mpt sd nifdc Chau A [2, 3] Brogen AS, Shantlbala K, Rajkumarl B, Laishram J (2009) Determination of sex ratio by birth order in an urban community in Manipur, V KET LUAN Vdi sU gia tang va tri ty sd gidi sinh cao Indian J Public Health, 53 (1): - hdn nhilu so vdi mde binh thfldng, nghien eflu da Christophe ZG, Xuyen Hoang, Toan Ngo chi thifc trang mat can bang v l ty sd gidi d mpt Van (2009) Recent Increase in Sex Ratio at Birth vung ndng thdn cua Viet Nam Ty so' gidi sinh in Vietnam, PLoS One, (2): - cao d nhflng ba me Idn tudi, cd trinh dp hoc van Chuc NT, Diwan V (2003) FilaBavi, a cao va nhflng lan sinh mudn, chfla cd eon trai demographic surveillance site, an epidemiological nghien cdu ehi mang tinh gdi y Viee field laboratory in Vietnam, Seand j Public Health giam sat, nghien cdu tren pham vi rpng hdn ve xu SuppI 62: - hudng va mdi lien quan gifla ty sd gidi sinh vdi Chun H, Kim I H , Khang YH (2009) Trends hanh vi lUa chpn gidi tinh trUdc sinh la can thiet de ed nhflng bang chflng d i y du hdn v l sfl mat can in sex ratio at birth according to parental social positions: results from vital statistics birth, 1981 - bang gidi tinh sinh d Viet Nam 2004 in Korea], J Prev Med Public Health 2009 TAI LIEU T H A M KHAO Mar, 42 (2): - Nguyfin Viet Tie'n, Ngo Van Toan (2008) Mathews TJ, Hamilton BE (2005) Trend Ty sd gidi tfnh sinh d Viet Nam nam 2006, analysis of the sex ratio at birth in the United Tap chf nghien cdu Y hpe, 56 (4): - States, Natl Vital Stat Rep, 53 (20): - Summary SEX RATIO AT BIRTH - A LONGITUDINAL SURVEY IN BAVI DISTRICT, HANOI CITY FROM 2000 - 2009 The sex ratio at birth (SRB) has recently becoming imbalaneed in Vietnam Objective: To describe the situation and the trend of SRB and related factors at Bavi district from 2000 - 2009 Method: Data from 8608 live births identified through quarterly household interviews at FilaBavi health and demographic surveillance site from 2000 - 2009 Results: SRB has remarkably increased for the last ten years with the mean was 114.6 (fluctuated from 104.8 to 129.4), much higher than the normal level It seemed to be higher among women who were above 35 years of age, or graduated from secondary school at least or among non - farmer women The SRB also tended to worsen for higher birth order children with the highest ratio was found at the third or above childbirth (120.9), especially among women without previous sons (122.9) Conclusion: Results indicated the significant imbalance in SRB in Bavi and suggested suggested the need of a study on SRB in relation to the sex - selective behaviour at a broader scale Keywords: sex ratio at birthi, longitudinal, rural area 97 ... cua ba me tai hpi Ke't qua nghien eflu difdc trinh bay difdi huyen Ba Vi giai doan 2000 - 2009 dang d e bang, bieu 94 TCNCYH phu trWdng 71 (6) - 2010 III KET QUA nam 2009 Mae du ty sd gidi sinh. .. dung de kiem dinh thgc trang va xu hddng thay ddi ty sd gidi xae sua't sinh ecn trai va md'i lien quan eua ty sinh theo thdi gian va tim hieu mdi lien quan vdi sd gidi sinh vdi mpt sd ye'u t... the cd mdi lien quan cua ty sd gidi sinh vdi ap ty sd gidi sinh d Viet Nam - Tdng quan d c life phai sinh eon trai d nhflng ba me chi ed gai b i n g chflng Ha Npi, t h i n g 8 /2009 va vdi hanh