Using the above eight factors as independent variables,
HADS-A and HADS-D were found to be significant predictive
factors of the MCS of SF-12, accounting for 310% of
the variance (Table 5). The tolerance level of collinearity
diagnostic for the independent variables ranged from 061–
092, and unstandardised residual was also normally
distributed (p = 020), indicating the statistical assumptions
of regression analysis being satisfied.