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Table 3 Hazard and duration estimations, Cox and Weibull models<br />

Hazard<br />

Duration (Weibull)<br />

(1) (2) (3) (4) (5)<br />

Cox<br />

Weibull<br />

Estimated effect on<br />

duration<br />

Average<br />

duration<br />

(years)<br />

Estimated effect on<br />

average duration (months)<br />

First sexual encounter<br />

First pregnancy<br />

Second pregnancy<br />

First temporary contraception<br />

method<br />

0.045 0.049 -0.024 7.4 -2.1<br />

(0.013)*** (0.016)*** (0.008)***<br />

0.010 0.033 -0.019 8.5 -1.9<br />

(0.014) (0.018)* (0.010)*<br />

-0.027 -0.016 0.012 3.3 0.5<br />

(0.014)* (0.021) (0.015)<br />

0.056 0.067 -0.065 7.0 -5.5<br />

(0.016)*** (0.020)*** (0.020)***<br />

See notes in table 2.<br />

Robust standard errors in parentheses<br />

* significant at 10%; ** significant at 5%; *** significant at 1%<br />

15

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