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Table 1 Comparison between previous population studies in Östhammar, Sweden. Age, sex and education level at different stages of the sampling process. From the first population sample in 1988 to the present study 1996. ns = p > 0.05.

From: Psychological illness is commonly associated with functional gastrointestinal disorders and is important to consider during patient consultation: a population-based study

Group (G) Sample Year n Age years mean (SD) Sex % males Education median level (range)
1 First population sample 1988 1156 48.9 (16.0) 50.4 3 (1–4)*
2 Eligible sample 1995 1428 49.9 (17.2) 49.9 3 (1–4)**
3 Population sample 1995 911 49.2 (16.46) 47.0 3 (1–4)
4 Sample group FGID 1995 244 45.5 (15.3) 36.1 3 (2–4)
5 Sample Group SSF 1995 219 51.7 (17.6) 51.6 3 (1–4)
6 Study Group FGID 1996 141 45.7 (14.3) 34.0 3 (2–4)
7 Study Group SSF 1996 97 52.4 (15.3) 48.0 3 (1–4)
G2 vs G3     ns ns  
G2 vs G3     ns ns ns
G4 vs G6     ns ns ns
G5 vs G7     ns ns ns
  1. *responders = 1156 **responders n = 1384