Table 1.
Characteristics of subsample with lung function measurements and the total Isle of Wight (IOW) cohort
| Subsample with lung function measurements (n=1121) | Total cohort (n=1536) | ||||
|---|---|---|---|---|---|
| Variables |
N |
% |
N |
% |
p-value |
| Gender |
|
|
|
|
|
| Males |
557 |
49.7 |
786 |
51.2 |
0.45 |
| Females |
564 |
50.3 |
750 |
48.8 |
|
| Missing |
0 |
|
0 |
|
|
|
In utero smoke exposure |
|
|
|
|
|
| Yes |
253 |
22.7 |
384 |
25.2 |
0.12 |
| No |
864 |
77.4 |
1137 |
74.8 |
|
| Missing |
419 |
|
15 |
|
|
| SHS smoke exposure at age 10 |
|
|
|
|
|
| Yes |
508 |
45.3 |
848 |
56.7 |
0.26 |
| No |
609 |
54.3 |
647 |
43.3 |
|
| Missing |
419 |
|
41 |
|
|
| SHS smoke exposure at age 18 |
|
|
|
|
|
| Yes |
563 |
55.2 |
716 |
56.7 |
0.49 |
| No |
457 |
44.8 |
548 |
43.3 |
|
| Missing |
516 |
|
272 |
|
|
| Active smoking at age 18 |
|
|
|
|
|
| Yes |
276 |
26.9 |
368 |
28.8 |
0.30 |
| No |
752 |
73.2 |
910 |
71.2 |
|
| Missing |
508 |
|
258 |
|
|
| |
Median (5th percentile, 95th percentile); n |
|
|||
| Height at age 10 (cm) |
138.7 (129.1, 149.5); 1026 |
138.7 (129.1, 149.5); 1043 |
0.98 |
||
| Missing |
510 |
493 |
|
||
| Height at age 18 (cm) |
171.0 (156.5, 186.5); 918 |
171.0 (156.5, 187.0); 994 |
0.64 |
||
| Missing |
618 |
542 |
|
||
| BMI at age 10 (kg/m2) |
17.4 (14.7, 24.1); 1026 |
17.4 (14.7, 23.9); 1043 |
0.92 |
||
| Missing |
510 |
493 |
|
||
| BMI at age 18 (kg/m2) |
22.2 (18.2, 32.2); 896 |
22.2 (18.2, 32.2); 964 |
0.91 |
||
| Missing | 640 | 572 | |||
SHS Secondhand smoke, BMI Body Mass Index.