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[Unpublished] 1994. Presented at the 1994 Southern Demographic Association Annual Meeting, Atlanta, Georgia, October 20-22, 1994. , 40, 10 p.This analysis uses two different measures of the parity progression ratio (PPR) in a period analysis of fertility and the impact of the family planning program on fertility in Kenya. The study is part of a UNFPA project including 14 other developing countries. Survey data from the 1978 World Fertility Survey and the 1989 Demographic and Health Survey provide data for the analysis. PPR is calculated first by a life table technique using birth probabilities specific for parity and birth interval in a period. PPR in the second calculation is an age-parity-adjusted progression based on schedules produced by Feeney. Results are presented for marital unions, first birth, birth intervals, parity progression, the impact of the family planning program, and socioeconomic differences. The results show an increase in age at first birth during the 1970s and 1980s. There is also a decrease in first births among adolescents between the 1960s and the late 1980s. A new finding is a reverse trend; a 1 year decrease in median age at first marriage occurred in urban areas between 1981-85 and 1985-89. The decrease is attributed to an increase in adolescent marriage in the late 1980s. By the 1980s families were being built at older ages, and births were being spaced farther apart. Adolescent first births and high parity births declined between the 1960s and 1980s. The trends reflect a clear and consistent pattern of modernization and better health with decreased population growth. Fertility is expected to reach replacement level soon. The family planning program contributed to the decline in progression to 6th and higher parities by 5% over 30 years. Higher marriage age and later age at first birth were related to higher educational status, although rural marriage age was higher by 0.7 years than urban marriage age. There was a high rate of adolescent marital unions, particularly informal unions, in urban areas. Teenage births were higher in rural areas. Urban women had a lower PPR in all birth orders than rural women. Median birth interval did not vary with educational level. A shorter than 24 month birth interval for 2nd and low order births occurred among the most educated and those in urban areas.