Assessing the inequality in out-of-pocket health expenditure among the chronically and non-chronically ill in Saudi Arabia: a Blinder-Oaxaca decomposition analysis

Table 3 Wagstaff concentration index between the chronically and non-chronically ill

Illness	No. of observations	Index value	Robust Std. error	p-value
No chronic illness (A)	7121	–0.1195	0.0113	< 0.001
Chronic illness (B)	3664	–0.1985	0.0143	< 0.001
CI_B – CI_A		–0.078	0.018	< 0.001

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