Table 1 Background data on participants and urine samples (means and ranges)

N

152

65

87

Never-/ever-smokers (n)

60/91

27/38

33/53

Pack-years^a

13.8 (0.4-51.0)

14.5 (0.4-51.0)

13.3 (1.2-36.3)

Body mass (lbs)

165 (108–245)

183 (143–245)

150 (108–209)

Age

48 (24–70)

49 (30–70)

48 (24–64)

GFR (ml/min/1.73 m²)

101 (77.0-147)

99.5 (78-140)

101 (77.0-147)

24 h samples (n)

130

55

75

24 h collection time (hrs)

23.2 (20.5-26.6)

23.3 (21.5-26.6)

23.1 (20.5-24.8)

24 h volume (ml)

1878 (444–5790)

1795 (680–4199)

1938 (444–5790)

ON samples (n)

145

63

82

ON collection time (hrs)

8.7 (6.0-14.8)

8.7 (6.0-14.8)

8.6 (6.3-11.3)

ON volume (ml)

419 (95–1050)

434 (120-1050)

407 (95–1002)