Characteristic differences of respondents in three subgroups by percentage levels of IgG (%) identified by cluster analysis (N = 1400).

¶Other ethnic groups not included in analysis; number does not total 1400.†1 US Dollar = 3.0 Malaysian Ringgit (MYR).‡A higher score indicates decreasing preventive practices.§A higher score indicates increasing knowledge.***Association is significant at the 0.001 level.**Association is significant at the 0.01 level.*Association is significant at the 0.05 level.φOne-way analysis of variance (ANOVA).