Barely Significant

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This is supported by the statistical analysis which found that the main effect of intervention condition ( F (1, 1022) = 5.25, p = .02) was significant while that of wave ( F (1, 1022) = 3.15, p = .07) was marginally significant.
Although the risk of IHD development was greater in the low-income group than in the high-income group [RR (95% CI) for period 2: low-income group, 1.77 (1.52, 2.07); high-income group: 1.47 (1.31, 1.65)], the difference was marginally significant (p-value for heterogeneity: 0.06) (Table S5 , see Additional file 1).