Table 1.

Comparison of selected fertility measures derived by the birth history, P_it, and P_ait methods: Philippines 2003 DHS, whole country

Fertility Measure	Birth History Method	Pit Method	Pait Method
			Actual Birth Histories	Reconstructed Birth Histories
Cohort Estimates
TMFR	4.70	4.59	4.63	4.62
TFR	4.50	4.38	4.41	4.40
Mean Ac	28.6	na	28.4	28.5
Median Ac	28.5	na	28.3	28.4
Period Estimates
TMFR	3.69	3.65	3.38	3.47
TFR	3.48	3.45	3.18	3.27
Mean Ac	27.9	na	28.0	28.1
Median Ac	27.7	na	27.9	28.0

Notes: “Cohort” refers to the lifetime experience of women aged 45–49 at time of survey. “Period” refers to the five-year period preceding the survey. A_c denotes age at childbearing. Mean and median A_c refer to all births regardless of birth order. In the cohort case, the birth history estimates of TMFR and TFR are derived from PPRs calculated directly from numbers of first marriages and births experienced in earlier years by women aged 45–49 at time of survey, and the birth history estimates of mean and median A_c are calculated directly from the ages at childbirth associated with the births that occurred to women in the cohort. In the period case, the birth history estimates of TMFR and TFR are derived by Feeney’s PPR-based method, and the estimates of mean and median A_c are calculated from period ASFRs estimated by the conventional birth history method.