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Table 1 Comparison of non-participants to participants

From: Chlamydia trachomatis infection and sexual behaviour among female students attending higher education in the Republic of Ireland

Variables Categories Non-participants Participants Significance of difference
N   73 450  
Mean age in years (std)   21.1 (3.6) 20.6 (2.4) ns
Years in higher education (std)   2.3 (1.3) 3.0 (1.5) 0.001
   N (%) N (%)  
Higher Education Institution A 15 (20.5) 114 (25.3) ns
  B 29 (39.7) 180 (40.0) ns
  C 29 (39.7) 156 (34.7) ns
Ireland is not usual country of residence   4 (5.5) 28 (6.2) ns
Current user of oral contraceptive pill   39 (55.6) 269 (59.8) ns
  1. ns = non-significant, std = standard deviation