Fig. 1

Distributions of OOP payments across the household income quartiles. (a) Distribution of OOP payments in the total population. (b1) Distribution of OOP payments in Q1 households. (b2) Distribution of OOP payments in Q2 households. (b3) Distribution of OOP payments in Q3 households. (b4) Distribution of OOP payments in Q4 households. Abbreviations: OOP: Out-of-pocket; Q1: 1st Quartiles; Q2: 2nd Quartiles; Q3: 3rd Quartiles; Q4: 4th Quartiles