... Rothman, K. Modern Epidemiology. Boston/Toronto: Little Brown and Company 1986. 15. Langius A, Björvell H, Antonowsky A. The sense of coherence concept and its relation to personality traits in ... then coming from initially poorer conditions, and also the observation of increased exposure to pet animals in the NA group may support the ‘hygiene hypothesis’. An active, vital life style ... record examination and a ‘spectral analysis’ in remaining and non-remaining cases at the age of ten of asthma symptoms, signs and associated heredity, environmental risk exposition as well...