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Table 1 Clinical characteristics according to quartiles of year 15 serum adiponectin concentrations; CARDIA "calendar years".

From: Serum adiponectin is positively associated with lung function in young adults, independent of obesity: The CARDIA study

Year 15 adiponectin quartiles (Q) Q1 (n = 565) Q2 (n = 449) Q3 (n = 519) Q4 (n = 523) p value
Age (years) 40.2 (3.7) 40.2 (3.6) 40.2 (3.6) 40.5 (3.5) 0.51
Race (% blacks) 62 46 36 27 <0.001
Sex (% men) 70 53 41 22 <0.001
Education level (completed high school or lower) (%) 26 20 17 17 <0.001
Smoking Status      0.003
Never smoker, % 65 65 65 64  
Former smoker, % 14 14 19 21  
Current smoker, % 21 20 16 15  
Body Mass Index (kg/m2) 31.0 (6.1) 29.5 (6.9) 27.9 (6.2) 25.3 (5.2) <0.001
Physical Activity score (exercise units) 355 (301) 347 (288) 352 (286) 369 (275) 0.66
Serum C-reactive protein (g/ml) 3.9 (5.1) 3.0 (3.8) 2.8 (6.0) 1.9 (3.2) <0.001
ln (Homeostasis Model Assessment, HOMA units) 1.5 (0.5) 1.3 (0.4) 1.2 (0.4) 1.1 (0.4) <0.001
FVC at year 10 (ml) 4464 (1027) 4395 (1064) 4381 (1046) 4204 (942) <0.001
FEV1 at year 10 (ml) 3568 (775) 3507 (813) 3510 (793) 3371 (696) <0.001
FEV1/FVC at year 10 (%) 80.4 (5.5) 80.3 (5.7) 80.5 (5.5) 80.7 (6.1) 0.65
  1. Note 1: All variables were measured at year 15 except Forced vital capacity (FVC), Forced Expiratory Volume in 1 second (FEV1) and FEV1/FVC that were measured at year 10 and are expressed as mean (standard deviation) or percent.
  2. Note 2: Quartile cutpoints for serum adiponectin concentrations are ≤6.99, 7.00-9.59, 9.60-14.39, and ≥ 14.40 mg/l.