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Table 3 Prevalence ratios (PR) with 95% confidence intervals (95%CI) for reported heavy menstrual bleeding

From: Menstrual bleeding patterns: A community-based cross-sectional study among women aged 18-45 years in Southern Brazil

Level Variable Crude PR (95% CI) p Adjusted PR (95% CI)1 p
1 Age (years)   0.0006   0.0008
  18-24 1   1  
  25-29 0.68 (0.48-0.97)   0.67 (0.47-0.94)  
  30-34 1.00 (0.75-1.33)   0.98 (0.73-1.31)  
  35-39 1.24 (0.94-1.63)   1.19 (0.90-1.57)  
  40-45 1.36 (1.06-1.75)   1.31 (1.02-1.69)  
1 Education level (years)   0.0014   0.005
  0-4 1   1  
  5-8 0.97 (0.78-1.20)   1.01 (0.82-1.26)  
  ≥9 0.67 (0.52-0.88)   0.71 (0.55-0.92)  
2 BMI2   0.006   0.01
  ≤ 24.9 1   1  
  25.0-29.9 0.92 (0.73-1.15)   0.90 (0.72-1.13)  
  ≥ 30.0 1.35 (1.09-1.66)   1.29 (1.04-1.59)  
3 Number of pregnancies   <0.0014   0.0014
  0 1   1  
  1-3 1.36 (0.94-1.99)   1.20 (0.81-1.77)  
  ≥ 4 2.15 (1.46-3.17)   1.58 (1.02-2.43)  
3 Contraceptive method currently in use3   <0.001   <0.001
  Pill/Injectable hormones 0.64 (0.51-0.82)   0.66 (0.52-0.84)  
  IUD 1.50 (1.10-2.04)   1.36 (0.99-1.87)  
  Tubal ligation 1.81 (1.45-2.25)   1.59 (1.25-2.01)  
  Preservative/other methods/none 1   1  
4 Duration of menstrual periods (days)   <0.0014   <0.0014
  ≤ 3 1   1  
  4 1.25 (0.91-1.73)   1.21 (0.88-1.67)  
  ≥ 5 2.77 (2.19-3.50)   2.27 (1.80-2.87)  
4 Extra-menstrual bleeding   <0.001   0.03
  No 1   1  
  Yes 1.66 (1.33-2.07)   1.28 (1.01-1.63)  
4 Presence of blood clots   <0.001   <0.001
  No 1   1  
  Yes 1.80 (1.48-2.20)   1.44 (1.18-1.76)  
  1. 1Confounder control was carried out for variables in the same level and variables in higher levels; 2BMI: Body Mass Index; 3Currently pregnant (n = 35) and women at menopause (n = 19) excluded; 4test for linear trend