Longitudinal association between parents' reported vaccination program preferences and children's actual immunization patterns in Shanghai, China.

Families with a monthly income greater than 7,500 RMB (1,028 USD) were more likely to accept the quadrivalent vaccine compared to those earning less (OR = 1.90, 95% CI = 0.94–3.82), though this association approached but did not reach statistical significance ( P = 0.07).

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