TABLE 1.
COMPARISON OF ELIGIBLE STUDENTS BY STUDY PARTICIPATION USING RESULTS OF THE LUNG HEALTH SURVEY (n = 1,169)*
| Variable | Participants (n = 314) | Nonparticipants (n = 855) | p | ||
|---|---|---|---|---|---|
| Physician diagnosis of asthma, % (n) | 69.4 | (219) | 53.4 | (413) | < 0.001† |
| Age, mean (SD), yr | 15.3 | (1.0) | 15.4 | (1.0) | 0.05 |
| Estimated income/person‡, mean (SD) | $12,049 | ($2,442) | $12,286 | ($2,481) | 0.10 |
| Female, % (n) | 63.4 | (199) | 53.9 | (461) | 0.004† |
| Exposed to household ETS, % (n) | 59.2 | (170) | 59.4 | (477) | 0.96† |
| Smoke ⩾ 2/cigarettes on days smoked in last 30 d, % (n) | 5.2 | (15) | 7.7 | (61) | 0.14† |
| Intent to smoke/6 mo, % (n) | 6.1 | (17) | 7.0 | (54) | 0.59† |
| Asthma severity, % (n) | |||||
| Mild, intermittent | 62.6 | (189) | 67.7 | (567) | 0.003†§ |
| Mild, persistent | 19.6 | (59) | 10.9 | (91) | |
| Moderate | 8.9 | (27) | 10.4 | (87) | |
| Severe | 8.9 | (27) | 11.0 | (92) | |
| Functional status, mean (SD) | |||||
| Symptom days in last 30 d | 3.8 | (5.9) | 3.4 | (5.9) | 0.08 |
| Symptom nights in last 30 nights | 2.7 | (5.0) | 2.9 | (6.1) | 0.10 |
| Days of restricted activity in last 30 d | 3.8 | (6.1) | 3.5 | (5.9) | 0.08 |
| Days had to change plans in last 30 d | 1.2 | (3.7) | 1.2 | (3.9) | 0.40 |
| School days missed due to asthma in last 30 d | 1.8 | (4.3) | 1.6 | (4.5) | 0.03 |
| Medical care use, mean (SD) | |||||
| ED visits in last 12 mo | 2.3 | (6.1) | 2.2 | (6.8) | 0.06 |
| Hospitalizations in last 12 mo | 1.0 | (4.6) | 1.1 | (6.8) | 0.41 |
Definition of abbreviations: ED = emergency department; ETS = environmental tobacco smoke.
*
Thirty-six students returned consent forms but did not complete baseline surveys and were not randomized.
†
Chi-square test.
‡
Average household income for zip code divided by number of persons residing in that zip code.
§
Pairwise analysis for participating vs. nonparticipating: mild intermittent, p = 0.10; mild persistent, p < 0.001; moderate persistent, p = 0.47; severe persistent p = 0.31.