. Author manuscript; available in PMC: 2019 Jun 12.

Published in final edited form as: Demogr Res. 2014 Feb 7;30:413–428. doi: 10.4054/DemRes.2014.30.14

Table 4.

Odds ratios (with standard errors) for being subsequently infertile obtained through logistic regression for women from the 1992, 1996, 2001–02 and 2007 ZDHS surveys, treating women using contraception as though they were fertile

	1992	1996	2001–02	2007

Age group
20−24		Reference group
25−29	3.5 (0.3)^*	3.5 (0.2)^*	3.5 (0.3)^*	3.8 (0.3)^*
30−34	5.7 (0.5)^*	6.5 (0.5)^*	5.8 (0.5)^*	7.3 (0.7)^*
35−39	10.4 (1.1)^*	12.3 (1.1)^*	11.0(1.2)^*	14.3 (1.6)^*
40−44	31.0 (3.8)^*	33.2 (3.7)^*	31.2 (3.9)^*	37.9 (5.2)^*
45 and older	83.0 (17.4)^*	65.1 (11.1)^*	70.6 (13.9)^*	66.7 (12.4)^*
Time Period^**
1964−1972	Reference group		No observations
1973−1981	1.8 (0.5)	10.6 (7.4)^*	Reference group
1982−1990	3.8 (1.2)^*	22.9 (16.5)^*	1.6 (0.4)	Reference group (1973–1999)
1991−1999	5.7 (1.8)^*	45.2 (32.9)^*	2.6 (0.8)^*	Reference group (1973–1999)
2000−2007	N/A	N/A	4.2 (1.3)^*	1.5 (0.2)^*
Intercept	0.01 (0.0)^*	0.001 (0.0)^*	0.01 (0.0)^*	0.02 (0.0)^*
Pseudo R²	0.19	0.22	0.19	0.18
Cases	3399	3813	3744	3636
Observations	40233	45708	44099	43040

Significant at the p<0.01 level

^**

For the 2007 ZDHS most observations were in the latest time period and earlier time periods were combined to adjust for the relatively few observations.