Table 3

 Baseline characteristics of study patients

ControlInterventionp Value*
RecruitedCompletedRecruitedCompleted
Values are mean (SD) or number (%).
FEV1, forced expiratory volume in 1 s; FEV1/FVC, forced expiratory volume in 1 second/forced vital capacity; BMQ, Brief Medication Questionnaire; AQLQ, Asthma-related Quality of Life Questionnaire; CQ, Consumer Asthma Knowledge Questionnaire; PCAQ, Perceived Control of Asthma Questionnaire; reliever, short-acting β2 agonists or anticholinergic bronchodilators; preventer, inhaled corticosteroids, theophylline derivatives, cromolyns, leucotriene receptor antagonists or oral corticosteroids; LABA, long-acting β2 agonists.
*Comparing intervention and control groups at recruitment using independent samples t test unless otherwise noted.
†Not all patients responded to all questions and therefore numbers do not always add up to total.
‡χ2 test.
¶Range (best – worst): 1–7.
§Range (best – worst): 2–10.
**Range (worst – best): 0–12.
††Range (best – worst): 11–55.
Number of patients†205186191165
Age at recruitment (years)50.4 (16.1)50.9 (15.9)47.5 (17.1)49.3 (17.0)0.08
Male/female (%)39.5/60.539.2/60.832.5/67.530.3/69.70.18‡
Asthma severity/control
    Mild3 (1.5%)3 (1.6%)5 (2.6%)5 (3.0%)<0.001‡
    Moderate56 (27.7%)50 (27.2%)18 (9.4%)15 (9.1%)
    Severe143 (70.8%)131 (71.2%)168 (88.0%)145 (87.9%)
Smoking status
    Current47 (23.0%)41 (22%)40 (20.9%)32 (19.4%)0.05‡
    Former45 (22.1%)40 (21.5%)26 (13.6%)22 (13.3%)
    Never112 (54.9%)105 (56.5%)125 (65.4%)111 (67.3%)
Other lung disease39 (19.2%)37 (19.9%)15 (7.9%)14 (8.5%)<0.001‡
Spirometry
    FEV1 (% predicted)75.4 (22.5)74.1 (22.0)79.3 (22.8)79.7 (22.9)0.12
    FEV1/FVC (% predicted)86.2 (15.7)86.0 (15.6)87.8 (15.8)88.2 (15.9)0.37
Daily dose of salbutamol (μg)382.8 (515.3)328.6 (371.9)436.3 (532.9)450.9 (566.2)0.41
BMQ regimen screen¶1.21 (1.11)1.17 (1.09)1.51 (1.09)1.51 (1.11)0.01
AQLQ§4.26 (1.53)4.21 (1.53)4.45 (1.40)4.45 (1.41)0.22
CQ**7.68 (2.29)7.77 (2.24)7.80 (2.24)7.75 (2.23)0.59
PCAQ††25.09 (5.78)24.97 (5.71)26.15 (5.92)25.96 (5.85)0.08
Correct inhaler techniqueNot assessedNot assessed41 (23%)39 (25.5%)N/A
Asthma action planNot assessedNot assessed36 (20.1%)36 (22.9%)N/A
Adherent to preventer medication88 (57.9%)82 (60.3%)83 (53.2%)74 (55.2%)0.48‡
Medication profile
    Reliever only31 (15.7%)30 (16.9%)24 (12.8%)22 (13.6%)0.51‡
    Preventer + reliever ± LABA166 (84.3%)148 (83.2%)163 (87.2%)140 (86.4%)