Table 1.

Characteristics of sample surveys.

Countries surveyed	Study location	Respondent ages	Respondent sex	Interview mode	Study dates	Sample size
Argentina	Urban agglomerates over 500,000 people	18 and older	Both	Face-to-face	2008	1003
China	Gansu Province	17 and older	Both	Face-to-face	2007	633
Egypt	One district each in Fayoum and Qaliubia Provinces	Women 18–54 and their husbands	Both	Face-to-face	2007–2008	1500
Iran	Yazd City	Married: 15–54 Unmarried: 15–29	Women	Face-to-face	2007	703
Nepal	Chitwan Valley	15 and older	Both	Face-to-face	2008–2009	7455
USA	National	18 and older	Both	Telephone	2006	486