求翻译：12例无尿常规异常的患儿为单纯性紫癜组（第4组）；同期选取19例我院儿科门诊体检的健康儿童作为对照组。是什么意思？

12 cases of children with abnormal urine for the simple the purpuric group (group 4); the same period to select the 19 cases of hospital pediatric outpatient medical examination of healthy children as control group.

No urine 12 cases of children suffering from general exception of purpura is a simple group (group 4) pick; during the same period 19 pediatric out-patient medical Academy of healthy children as a comparison group.

12 examples do not have the routine urine test unusual trouble for the retinitis simplex purpura group (4th group); Selects 19 examples same time I the courtyard department of pediatrics outpatient service physical examination the healthy child takes the control group.

12 cases of non-routine urine abnormality in children with Purpura Simplex Group (4th group); over the selected 19 cases of Pediatric outpatient Department of our hospital physical examination as a control group of healthy children.

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