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Table 1 Baseline characteristics of participants according to decile of baseline white blood cell count (n = 29,925) in Guangzhou Biobank Cohort Study, 2003–2016

From: White blood cell count and all-cause and cause-specific mortality in the Guangzhou biobank cohort study

  Decile of White Blood Cell Count, × 109/L  
1st decile (f < 4. 5; m < 4.7) (n = 2845) 2nd decile (f 4.5–4.8; m 4.7–5.2) (n = 2542) 3rd decile (f 4.9–5.3; m 5.3–5.7) (n = 3516) 4th decile (f 5.4–5.6; m 5.8–6.0) (n = 2725) 5th decile (f 5.7–6.0; m 6.1–.4) (n = 3308) 6th decile (f 6.1–6.3; m 6.5–6.8) (n = 2550) 7th decile (f 6.4–6.8; m 6.9–7.2) (n = 3293) 8th decile (f 6.9–7.3; m 7.3–7.8) (n = 2978) 9th decile (f 7.4–8.2; m 7.9–8.7) (n = 3085) 10th decile (f > 8.2; m > 8.8) (n = 3083) P for difference
Percentage
 Men 26.3 33.8 23.0 31.6 26.1 30.9 23.1 29.3 27.4 28.3 < 0.001
 Education (college or above) 11.5 12.0 10.0 10.1 9.7 8.3 7.0 8.2 7.0 6.2 < 0.001
 Occupation (manual) 56.5 57.1 58.2 59.2 59.5 61.1 63.4 63.7 65.1 66.5 < 0.001
 Current smokers 5.4 7.6 5.9 8.8 8.8 10.8 8.4 12.7 13.7 18.6 < 0.001
 Current alcohol drinkers 23.5 25.1 23.3 26.8 24.5 25.4 22.7 24.9 23.5 23.3 < 0.001
 IPAQ Physical activity (active) 49.6 48.5 50.4 51.3 52.6 52.1 52.0 50.6 50.4 50.7 0.006
 Self-rated health (good/very good) 81.4 82.6 83.3 83.8 83.3 83.1 83.0 81.4 80.6 79.7 < 0.001
 Diabetes 5.9 7.4 8.7 9.7 10.9 11.5 13.5 16.0 18.5 21.1 < 0.001
Mean (SD)  
 Age, years 61.3 (7.2) 61.7 (7.1) 61.2 (7) 62 (7.2) 61.8 (7.1) 62 (7) 62.1 (7) 62.5 (7) 62.6 (7.2) 63 (7.1) < 0.001
 Body mass index, kg/m2 22.2 (3.1) 22.9 (3.1) 23.3 (3.1) 23.5 (3.1) 23.8 (3.2) 23.9 (3.2) 24.2 (3.2) 24.4 (3.3) 24.5 (3.3) 24.7 (3.5) < 0.001
 Triglycerides, mmol/l 1.2 (0.8) 1.4 (1.0) 1.5 (1.1) 1.6 (1.2) 1.7 (1.3) 1.7 (1.2) 1.8 (1.2) 1.8 (1.4) 2.0 (1.5) 2 (1.5) < 0.001
 HDL-cholesterol, mmol/l 1.8 (0.4) 1.7 (0.4) 1.7 (0.4) 1.6 (0.4) 1.7 (0.4) 1.6 (0.4) 1.6 (0.4) 1.6 (0.4) 1.6 (0.4) 1.6 (0.4) < 0.001
 LDL-cholesterol, mmol/l 3.15 (0.69) 3.24 (0.72) 3.27 (0.70) 3.24 (0.69) 3.28 (0.71) 3.29 (0.71) 3.27 (0.70) 3.29 (0.70) 3.28 (0.70) 3.30 (0.73) < 0.001
 Haemoglobin, g/l 131.3 (13.7) 134.9 (13.6) 134.3 (12.9) 136.3 (13) 136.5 (12.9) 137.4 (13.4) 137.1 (12.9) 138.1 (13.5) 138.5 (13.8) 139.8 (13.8) < 0.001
 Platelet count, 109/l 190.7 (51.3) 204.7 (50.1) 215 (62.7) 218.7 (48.8) 224.8 (50.9) 230 (52.2) 234.5 (57.8) 239.5 (55.8) 246.1 (55.4) 262.8 (77.8) < 0.001
 Waist circumference, cm 82.67 (17.2) 80.30 (9.14) 81.23 (18.60) 81.85 (9.10) 82.60 (17.3) 82.95 (8.98) 83.79 (17.56) 84.00 (9.09) 84.13 (9.11) 84.82 (8.90) 0.32
 FEV1, L 1.96 (0.52) 2 (1.39) 1.96 (3.65) 1.92 (0.54) 1.93 (1.67) 1.91 (0.54) 1.86 (1.24) 1.9 (3.67) 1.8 (0.52) 1.75 (0.55) < 0.001
 FVC, L 2.52 (0.71) 2.55 (0.71) 2.44 (0.63) 2.47 (0.65) 2.42 (0.62) 2.45 (0.66) 2.36 (0.66) 2.36 (0.67) 2.33 (0.74) 2.28 (0.68) < 0.001