在采用第一种方法进行的调查中，尼日利亚、墨西哥、巴西和波多黎各成绩不错，这样的结果表明答案可能与民族文化有关，而不取决于健康、教育和生活标准等客观指标。
On surveys that use the first approach, countries like Nigeria, Mexico, Brazil, and Puerto Rico do well, which suggests that the answer may have more to do with the national culture than with objective indicators like health, education, and standard of living.