PIP: The follow-up records of the 4067 women accepting Lippes loops (27.5 and 30 mm) during 1967-1968 in 15 randomly selected member mission hospitals of the Family Planning Project of the Christian Medical Association of India were studied. 97.7% of the insertions were not postpartum. Median age was 29.8. The difference between the mean number of living children, 3.7, and the mean parity, 4.9, suggests that a relatively high rate of infant and child mortality is characteristic of IUD acceptors. Analysis of the responses of 1656 acceptors to 1 query showed attitude toward the loop was favorable by both husband and wife in 77.3% of these cases and by either husband or wife in 90.5% of these cases. Expulsions, removals, and pregnancies were unaffected in any significant way by age. Expulsion, removal, and pregnancy rates were higher, but nonsignificantly so, for the 27.5 mm than for the 30 mm loop. The 27.5 mm loop was associated with a significantly higher proportion (p less than .05) of prolonged and heavy bleeding than was the 30 mm loop. The average number of women months of use was 6.7 (very low in a follow-up study of 24 months) and more or less unrelated to age. Most removals were due to bleeding, symptoms associated with bleeding, or desire for planned pregnancy. Removal rate was more or less uniform for all parities. With increase in the duration of use up to 18 months the complaint rate appeared to decrease, but after 18 months it appeared to increase again suggesting that IUDs cause irritation of the endometrium after long periods of use. Women less than age 25 had a significantly greater (p less than .01) percentage of reinsertion than did women age 25 or greater. The cumulative net termination rate after 24 months was 53.9 (plus or minus 1.4) per 100 first insertions, a rate comparing well with similar Indian figures. Pregnancy rate was 2 per 100 first insertions. Of the 2 devices the 30 mm loop seems the more effective and ideally suited for fertility control.