Time-trend changes and psychological risk factors for soiling: findings from the Finnish 16-year time-trend study.

AIMS To study changes and associated risk factors in 8-year-old children's soiling at three time points: 1989, 1999 and 2005. METHODS Three cross-sectional representative samples were compared. All children born in 1981 (1989 sample, n = 1038), 1991 (1999 sample, n = 1035) and 1997 (2005 sample, n = 1030) living in selected school districts in south-west… (More)