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我们自1992年至1994年连续三年调查了小学生蛔虫感染情况,结果1992年感染率8.84％(29/328),1993年感染率4.17％(7/168)、1994年感染率5.24％(10/191),经检验X~2=4.78 P>0.05,各年感染率之间无显著性差异。
As a result, the prevalence of ascaris infection among primary school students from 1992 to 1994 was 8.42% (29/328) in 1992, 4.17% (7/168) in 1993 and 5.24% (1994) in 1994 / 191). After tested X ~ 2 = 4.78 P> 0.05, there was no significant difference in infection rates between years.