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Table 1 Demographic and obstetrical information of subjects with menstrual irregularities in case and control groups

From: The risk of menstrual abnormalities after tubal sterilization: a case control study

  (57) case group (143) control group df pv
  No. (%) No. (%)   
Age groups(year):     
30–39 31(54.3) 50(34.96) 1 0.0176819
40–45 26(45.6) 93(65.1)   
Parity groups (No.):     
2–4 8(14) 31(22) 2 0.3819013
5–7 28(50) 58(40)   
>7 21(36) 54(38)