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. 1998 Jun 27;316(7149):1948–1952. doi: 10.1136/bmj.316.7149.1948

Table 2.

Effect of intervention on knowledge of contraception (number (%) knowing rules, and odds ratios* (95% confidence intervals) of knowing rules compared with control (no intervention))

Variable No questions
Questions
Likelihood ratio χ2
No leaflet Summary leaflet Family Planning Association leaflet No leaflet Summary leaflet Family Planning Association leaflet
Pill failure:
 No (%) 35/82 (43) 45/82 (55) 54/91 (59) 60/102 (59) 60/77 (78) 57/97 (59)
 Odds ratio (95% CI) 1.00 1.77 (0.93 to 3.36) 2.10 (1.13 to 3.92) 1.86 (1.02 to 3.40) 4.95 (2.42 to 10.10) 2.09 (1.12 to 3.87) 22
Subsequent action:
 No (%) 18/82 (22) 31/82 (38) 35/91 (39) 41/99 (41) 40/78 (51) 34/97 (35)
 Odds ratio (95% CI) 1.00 2.84 (1.36 to 5.89) 2.77 (1.36 to 5.65) 2.93 (1.46 to 5.85) 4.95 (2.38 to 10.33) 2.60 (1.27 to 5.31) 21
Emergency pill§:
 No (%) 43/82 (52) 51/85 (60) 63/92 (69) 79/101 (78) 60/78 (77) 67/98 (68)
 Odds ratio (95% CI) 1.00 1.93 (0.96 to 3.87) 2.71 (1.34 to 5.47) 3.97 (1.94 to 8.13) 4.89 (2.75 to 8.71) 3.27 (1.62 to 6.61) 24
All correct:
 No (%) 10/82 (12) 22/80 (28) 24/90 (27) 25/98 (26) 30/77 (39) 20/96 (21)
 Odds ratio (95% CI) 1.00 4.04 (1.68 to 9.75) 3.43 (1.45 to 8.09) 3.03 (1.30 to 7.07) 6.81 (2.85 to 16.27) 2.58 (1.07 to 6.18) 22
*

Adjusted for past use of emergency contraception, importance of not falling pregnant, educational level, and years on contraceptive pill.  

Knowledge of all factors associated with pill failure.  

Knowledge of all actions after pill failure.  

§

Knowledge of emergency pill and its time limit of 72 hours.  

All significant at P<0.01.