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Table 1 Distribution of NOWAC postmenopausal participants according to consumption of total, filtered, boiled and instant coffee

From: High coffee consumption and different brewing methods in relation to postmenopausal endometrial cancer risk in the Norwegian Women and Cancer Study: a population-based prospective study

  Total coffee, %a Boiled coffee Filtered coffee Instant coffee
   Combined with other brewing methods, %b Only boiled coffee, % Combined with other brewing methods, % Only filtered coffee, % Combined with other brewing methods, % Only instant coffee, %
No of participants n = 97 926 n = 93 858 n = 32 049 n = 93 858 n = 60 025 n = 93 858 n = 22 501
≤ 1 cups per day 16.1 80.0 54.4 40.1 25.6 91.7 77.5
2-3 cups per day 32.9 7.9 16.1 25.9 30.4 5.4 13.3
4-7 cups per day 37.8 8.4 20.2 25.9 33.4 2.4 7.5
≥ 8 cups per day 13.2 3.7 9.3 8.1 10.6 0.5 1.7
No of cases n = 462 n = 452 n = 174 n = 452 n = 322 n = 452 n = 112
≤ 1 cups per day 17.7 77.9 51.2 44.2 27.6 92.7 79.5
2-3 cups per day 37.1 10.4 21.8 27.0 34.2 4.6 10.7
4-7 cups per day 38.3 10.2 23.0 25.0 32.9 2.3 8.0
≥ 8 cups per day 6.9 1.5 4.0 3.8 5.3 0.4 1.8
  1. aTotal coffee is combination of responses on total coffee consumption in the total coffee version of the questionnaire and filtered, boiled and instant coffee consumption in the brewing methods version of the questionnaire. bCombined with other types: those women who positively responded to question about “total coffee consumption” or/and other brewing method (filtered, boiled, instant).