cg1
cg1-
Methods Ninety patients were divided into three groups : laser group ( LG )( 30 patients ) and control groups 1 ( CG1 )( 30 patients ) and 2 ( CG2 )( 30 patients ) .
方法老年类风湿性关节炎患者90例，随机分为激光组和对照1组、对照2组，每组30例。
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Method : the author Selected 24 workers from heavily polluted area as the experimental group ( EG ), with a non-exerciser group as the masculine control group ( CG1 ), and 12 healthy workers from clean area as the negative control group ( CG2 ) .
方法：在空气污染区选取经常参加户外运动的人群为实验组（EG），非运动人群为阳性对照组（CG1）；在洁净区选取健康非运动人群为阴性对照组（CG2）。