Design: a randomized controlled and repeatedsurvey design was conducted.
设计:随机对照重复测量设计。
2
The survey was repeated in 2007 and 2008, with about three-quarters of the original group taking part in all three.
2007年和2008年都重复进行了这项调查,第一次受访的儿童有四分之三都参与了这三次调查。
3
The study, entitled Unpacking the beauty premium, was the largest exercise of its kind and repeated a survey from 1984 to see if the beauty premium had changed.