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Table 1 Main characteristics of participants included in this study by dietary fiber intake

From: Associations between dietary fiber intake and mortality from all causes, cardiovascular disease and cancer: a prospective study

Variables Q1 (n = 17,360) Q2 (n = 17,330) Q3 (n = 17,322) Q4 (n = 17,304) Q5 (n = 17,326) p
Age (years), mean (SD) 62.1 (5.2) 62.2 (5.2) 62.1 (5.2) 62.1 (5.2) 62.1 (5.2) 0.35
Sex (n, %)
 Female 6579 (37.9%) 7041 (40.6%) 7661 (44.2%) 8469 (48.9%) 9931 (57.3%)  < 0.001
 Male 10,781 (62.1%) 10,289 (59.4%) 9661 (55.8%) 8835 (51.1%) 7395 (42.7%)  
Arm (n, %)
 Screen 8747 (50.4%) 8808 (50.8%) 8686 (50.1%) 8998 (52.0%) 8968 (51.8%)  < 0.001
 Control 8613 (49.6%) 8522 (49.2%) 8636 (49.9%) 8306 (48.0%) 8358 (48.2%)  
Smoking (n, %)
 Never 7998 (46.1%) 8493 (49.0%) 8664 (50.0%) 8816 (51.0%) 8698 (50.2%)  < 0.001
 Current 2451 (14.1%) 1726 (10.0%) 1465 (8.5%) 1249 (7.2%) 1168 (6.7%)  
 Former 6909 (39.8%) 7107 (41.0%) 7192 (41.5%) 7231 (41.8%) 7457 (43.0%)  
Education (n, %)
 ≤ High school 8187 (47.2%) 7393 (42.7%) 7026 (40.6%) 6765 (39.1%) 6492 (37.5%)  < 0.001
 ≥ Some college 9126 (52.6%) 9911 (57.2%) 10,272 (59.3%) 10,494 (60.6%) 10,801 (62.3%)  
BMI (n, %)
 < 25.0 kg/m2 6169 (35.5%) 6264 (36.1%) 6217 (35.9%) 6190 (35.8%) 6155 (35.5%) 0.75
 ≥ 25.0 kg/m2 10,942 (63.0%) 10,842 (62.6%) 10,879 (62.8%) 10,903 (63.0%) 10,944 (63.2%)  
Race (n, %)
 White, Non-Hispanic 15,530 (89.5%) 15,932 (91.9%) 16,071 (92.8%) 16,045 (92.7%) 15,703 (90.6%)  < 0.001
 Other 1830 (10.5%) 1398 (8.1%) 1251 (7.2%) 1259 (7.3%) 1623 (9.4%)  
Marital status (n, %)
 Married 12,815 (73.8%) 13,622 (78.6%) 13,830 (79.8%) 13,845 (80.0%) 13,726 (79.2%)  < 0.001
 Not married 4505 (26.0%) 3685 (21.3%) 3466 (20.0%) 3412 (19.7%) 3571 (20.6%)  
  1. y year, SD Standard deviation, BMI body mass index