marriage reussi mar reus 0.1374 question quest 0.1374 women wom 0.1374 estimate estim 0.1374 significant signif 0.1374 opinion opinion 0.0497 Russians estimate rus estim 0.0497 men men 0.0497 daughters daughter 0.0497 survey surv 0.0497 results result 0.0081