Table 2.

Differences Between Missing and Present Subjects at 12 and 24 Months

12 Months24 Months
StatusMissing(n = 37)Present(n = 151)Missing(n = 74)Present(n = 114)
t-Test and χ2 tests used to compare missing to nonmissing
* Baseline MCS scores for 24 month missing vs nonmissing, P = .04; all other P values > .10
SD = standard deviation; PCS = physicial functioning and MCS = emotional functioning subscales of Short Form-36
Age, years48.5 (14.0)47.1 (13.9)45.5 (14.2)48.6 (1.3)
Mean (SD)
    % Minority19191820
    % Male8787
Hollingshead social class3.6 (1.0)3.5 (1.0)3.4 (1.0)3.5 (1.0)
Mean (SD)
    % with physical comorbidity73666668
    % with psychiatric comorbidity49384339
Baseline PCS scores44.5 (12.4)43.0 (11.3)44.9 (11.6)42.9 (11.5)
Mean (SD)
    Baseline MCS scores*48.2 (10.0)48.9 (9.0)47.0* (10.2)49.9* (8.3)
Mean (SD)
    % year 1 intervention41504551