Low wealth level refers to the wealth level of the poorer or poorest individuals; high wealth level refers to individuals with middle wealth level or higher; not finished refers to natural, rudimentary, or other materials; not married refers to individuals living with a partner, widowed, divorced, or separated; young or old refers to women or their partner under and over the mean age; low educational level refers to individuals with primary education or lower; and high educational level refers to secondary education or higher. Error bars represent 95% CIs.