Table 2

Characteristics of the entire study population and by CRS score (CRS ≤ 20; CRS > 20) in 521 subjects.


All subjects n = 521
CRS≤ 20 n = 248
CRS > 20 n = 273
Pa

Number of subjects (%)

Gender




Male
223 (42.8)
115 (46.4)
108 (39.6)

Female
298 (57.2)
133 (53.6)
165 (60.4)
0.13





Age (years)




0–9
2 (0.4)
2 (0.8)
-

10–19
17 (3.3)
13 (5.2)
4 (1.5)

20–29
32 (6.1)
21 (8.5)
11 (4.0)

30–39
88 (16.9)
44 (17.7)
44 (16.1)

40–49
105 (20.2)
42 (16.9)
63 (23.1)

50–59
148 (28.4)
56 (22.6)
92 (33.7)

60–69
90 (17.3)
45 (18.1)
45 (16.5)

70–79
31 (6.0)
18 (7.3)
13 (4.8)

80–89
6 (1.2)
5 (2.0)
1 (0.4)

90–99
2 (0.4)
2 (0.8)
-
0.001#





Median age (range)
51.2 (7.5–98.0)
51.4 (13.9–84.6)
50.2 (7.5–98.0)
0.44





Smoking




current
165 (31.7)
90 (36.3)
75 (27.5)

former
23 (4.4)
11 (4.4)
12 (4.4)

never
333 (63.9)
147 (59.3)
186 (68.1)
0.09

#calculated by using Kolmogorov-Smirnov test

Schnakenberg et al. Environmental Health 2007 6:6   doi:10.1186/1476-069X-6-6