Example sentences of "[prep] age [prep] first " in BNC.
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| 1 | With the possible exception of age at first union , these factors are readily susceptible to control and can be moderated . |
| 2 | Childlessness increased strongly with age at first marriage , even at ages where fecundity is usually still high . |
| 3 | This relation remained after adjustment for age at first intercourse and lifetime number of sexual partners . |
| 4 | Optimality theory has been successful in explaining diversity in life-history traits such as age of first breeding , number of breeding attempts and number of offspring produced at each . |
| 5 | In the economically more advanced countries , however , there does not exist a close relationship between age at first marriage and birth of first child , owing mainly to postponement of first birth through contraceptive use . |
| 6 | The value of the correlation coefficient is high , indicating a very strong relationship between age at first marriage and at first birth . |
| 7 | This may not always be the case — for example , in rapidly expanding populations , selection may favour reproductive rate at the expense of lifetime reproductive success ( see Lewontin , 1965 ; Elliot , 1975 ) — but exceptions are probably rare , especially in long-lived species where variation in longevity greatly exceeds variation in age at first breeding . |
| 8 | For the analysis we grouped patients according to age at first intercourse ( <17 or >18 ) and lifetime number of sexual partners ( 1–2 , 3–4 , 5–10 , and >11 ) . |