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Table 1 Baseline characteristics of study participants

From: A randomized controlled trial of vitamin E and selenium on rate of decline in lung function

Characteristic:

Placebo (n = 726)

Vitamin E (n = 726)

Selenium (n = 759 )

Vitamin E + selenium (n = 709)

Age at SELECT randomization, years

    

  Median (interquartile range)

61.7 (57.6–67.5)

61.5 (57.6–66.2)

61.6 (57.7–66.8)

61.5 (57.9–66.6)

  50-54

56 (8)

48 (7)

54 (7)

48 (7)

  55-64

418 (58)

459 (63)

466 (62)

435 (61)

  65-74

212 (29)

190 (26)

208 (27)

192 (27)

  ≥75

40 (6)

29 (4)

31 (4)

34 (5)

Race/ethnicity

    

  White

510 (70)

491 (68)

515 (68)

489 (69)

  African American

165 (23)

177 (24)

189 (25)

162 (23)

  Hispanic (non-African American)

20 (3)

32 (4)

22 (3)

22 (3)

  Hispanic (African American)

6 (1)

3 (<1)

5 (<1)

5 (1)

  Other

25 (3)

23 (3)

28 (4)

31 (4)

Education (highest level)

    

  ≤High school graduate or GED

157 (22)

172 (24)

176 (23)

169 (24)

  Some college/vocational school

210 (29)

221 (30)

216 (28)

203 (29)

  ≥College graduate

348 (48)

327 (45)

361 (48)

335 (47)

  Unknown/missing

11 (1)

6 (1)

6 (1)

2 (<1)

Smoking status

    

  Never

262 (36)

239 (33)

280 (37)

236 (33)

  Current

113 (15)

123 (17)

108 (14)

114 (16)

  Former

338 (47)

349 (48)

363 (48)

351 (50)

  Ever (Unknown current status)

6 (1)

9 (1)

5 (1)

7 (1)

  Unknown

7 (1)

6 (1)

3 (<1)

1 (<1)

Height at SELECT Randomization (cm), mean (standard deviation)

176.8 (8.2)

176.2 (7.8)

176.8 (7.3)

176.4 (7.8)

  1. Number (percent) unless otherwise noted.
  2. Participants who were ever smokers, but did not report current status to differentiate current versus former.