Table 4

Relationship of tea drinking and dysmenorrhoea

VariablesCrude OR model* Adjusted OR model
No (486)Mild (574)Moderate-to-severe (92)Mild  (574)Moderate-to-severe (92)
Tea
 No11111
 Yes10.86 (0.66 to 1.10)0.84 (0.52 to 1.34)0.68 (0.50 to 0.93)0.59 (0.32 to 1.04)
No of cups/day
 0 per day11111
 1–2 cups/day10.97 (0.71 to 1.33)1.06 (0.61 to 1.84)0.80 (0.55 to 1.17)0.71 (0.36 to 1.41)
 3–5 cups/day10.66 (0.44 to 0.98)0.57 (0.25 to 1.31)0.49 (0.31 to 0.79)0.39 (0.15 to 1.00)
  ≥ 6 cups/day10.80 (0.43 to 1.50)0.71 (0.21 to 2.45)0.75 (0.37 to 1.53)0.77 (0.21 to 2.86)
No of years of tea drinking
 1 year11111
 1–5 years10.64 (0.36 to 1.13)1.41 (0.44 to 4.50)0.53 (0.26 to 1.07)2.13 (0.40 to 11.2)
  ≥ 6 years10.61 (0.33 to 1.14)0.71 (0.18 to 2.73)0.54 (0.24 to 1.25)1.67 (0.25 to 11.2)
  • *Model 1 was a crude multinomial logistic regression which was used for each outcome.

  • †Model 2 was an adjusted multinomial logistic regression model for each outcome, and was adjusted for age, body mass index, personal income, ever pregnant, caffeinated beverages drinking, alcohol drinking now and during last 1 year, secondhand smoke, supplementation of fish oil, consumption of leaf vegetables, moderate-intensity and walk-intensity physical activity.