Estimated proportion of persons who injected drugs (PWID) in their lifetime, by survey and combined by meta-analysis, United States.

*Q2 = 45.1, p2 = 95.6.NSDUH = National Survey of Drug Use and Health (2002–2009); NHANES = National Health and Nutrition Examination Survey (1999–2008); GSS = General Social Survey (2000 – 2008).*Q2=45.1，p2=95.6。NSDUH：全国药物使用与健康调查（National Survey of Drug Use and Health，2002–2009）；NHANES：全国健康与营养检查调查（National Health and Nutrition Examination Survey，1999–2008）；GSS：综合社会调查（General Social Survey，2000–2008）。