Abstract
364 patients were instructed in the use of basal body temperature charts to limit family size. 107 couples claimed to understand the instruction after the 1st visit 1 required a 2nd instruction and 1 never was sure they comprehended the method. Follow-up showed almost 1/2 the group used the method for only 9.3 months. 47 couples continued it for an average of 15.2 months. Before attending the clinic the total group had an unplanned conception rate of 28 pregnancies/100 woman-years. Periodic continence with basal temperatures as a guide resulted in 8 unplanned pregnancies or about 8/100 woman-years. The low number of biphasic charts with abrupt rises in temperature (26%) contrasts sharply with the 80% reported by Marshall. Since sharp transitions obviously make interpretation easier the high percentage of charts with a gradual rise may have contributed to the high drop-out rate.
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