Table 1.

Reasons for exclusion of 292 women from study after sealed envelopes were assigned

Reason for exclusion	No of women
Had been referred for in vitro fertilisation	67
Had been referred for artificial insemination	92
Had been referred for tubal operation	4
Had problems unrelated to infertility*	94
Was pregnant at first visit	30
Did not give informed consent	5

^*Patients with endocrine problems, with questions on future fertility after exposure to diethylstilboestrol in utero, radiotherapy, chemotherapy, primary dysmenorrhoea etc.