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Table 1 Demographics of 2184 newly diagnosed RA cases and 4201 controls from the EIRA study, stratified by coffee consumption

From: Investigation of the association between coffee and risk of RA—results from the Swedish EIRA study

 

RA cases

Controls

Coffee, cups/day

< 2 cups/day

2–< 4 cup/day

4–< 6 cups/day

≥ 6 cups/day

< 2 cups/day

2–< 4 cup/day

4–< 6 cups/day

≥ 6 cups/day

Coffee, median cups/day

0.4

2.5

4.0

7.0

0.3

2.4

4.0

6.4

N

571

947

483

183

1164

1874

907

256

Female, n (%)

445 (78)

684 (72)

327 (68)

105 (57)

894 (77)

1401 (75)

573 (63)

136 (53)

Age, mean (SD)

49.8 (16.7)

56.4 (13.0)

56.4 (11.1)

55.5 (9.7)

51.1 (16.0)

56.6 (13.0)

56.2 (11.3)

55.2 (11.4)

Tea, n (%)

0 cups/day

149 (26)

377 (40)

289 (60)

120 (66)

309 (27)

765 (41)

505 (56)

182 (71)

≤ 2 cups/day

116 (20)

211 (22)

84 (17)

35 (19)

198 (17)

368 (20)

155 (17)

34 (13)

2–3 cups/day

110 (19)

175 (19)

73 (15)

16 (9)

219 (19)

376 (20)

137 (15)

23 (9)

> 3 cups/day

196 (34)

184 (19)

37 (8)

12 (7)

438 (38)

365 (20)

110 (12)

17 (7)

Smoking, n (%)

Current

68 (12)

168 (18)

159 (33)

87 (48)

76 (7)

207 (11)

196 (22)

94 (37)

Never

297 (52)

338 (36)

106 (22)

34 (19)

689 (59)

946 (51)

360 (40)

75 (29)

Former

145 (25)

347 (37)

174 (36)

52 (28)

264 (23)

536 (29)

272 (30)

61 (24)

Non-regular

43 (8)

62 (7)

27 (6)

3 (2)

83 (7)

117 (6)

39 (4)

13 (5)

Other

20 (2)

25 (3)

11 (2)

6 (3)

29 (3)

47 (3)

29 (3)

10 (4)

Education, n (%)

< 10 years

95 (17)

187 (20)

121 (25)

47 (26)

133 (11)

284 (15)

174 (19)

55 (22)

10–12 years

166 (29)

201 (21)

111 (23)

58 (32)

298 (26)

443 (24)

243 (27)

79 (31)

> 12 years

310 (54)

559 (59)

251 (52)

78 (43)

722 (63)

1147 (61)

490 (54)

122 (48)

BMI, mean (SD)

25.7 (5.1)

25.8 (4.6)

25.8 (4.4)

26.0 (4.4)

25.3 (4.7)

25.3 (5.5)

25.6 (4.0)

25.9 (3.9)

Alcohol intake, median grams/week (IQR)

29.0 (61)

38.0 (69.8)

41.0 (72.0)

41.5 (63.3)

29.0 (70.0)

47.0 (76.0)

48.0 (79.0)

43.5 (93.0)