Table 5

 Frequency of negative life events: demographic and health status covariates

Demographic groupStudy nFrequency of negative life eventsp Value
Mean (SD)Median (IQR)
FEV1, forced expiratory volume in 1 s; IQR, interquartile range (25th–75th centile).
p Values for all comparisons of life event frequencies are for the corresponding Wilcoxon’s rank sum test.
All subjects1894.3 (3.1)4 (2–6)NA
Sex0.90
    Male584.4 (3.3)4 (2–5)
    Female1314.2 (3.0)4 (2–6)
Race/ethnicity0.35
    White, non-Hispanic1344.2 (3.1)4 (2–5)
    All other554. 6 (3.0)4 (2–7)
Education0.35
    Some college or less964.5 (3.2)4 (2–7)
    College graduate or higher934.1 (3.0)4 (2–5)
Age (years)0.41
    <47904.4 (2.7)4 (2–6)
    ⩾47994.3 (3.4)4 (2–6)
Annual household income0.03
    <$60 000824.8 (3.2)4 (3–7)
    ⩾$60 0001073.9 (2.9)3 (2–5)
Cigarette smoking0.01
    Never1243.9 (2.8)3 (2–5)
    Ever655.1 (3.4)4 (3–7)
FEV1% predicted0.71
    <80714.4 (3.6)4 (2–6)
    ⩾801184.3 (2.8)4 (2–6)
Asthma Severity Score0.51
    <7954.3 (2.7)4 (2–6)
    ⩾7944.3 (3.4)4 (2–6)