Table 2. Results of principal component analysis based on nine national socioeconomic indicators for all 73 study countries.

Indicator	Component
	1	2	3	4	5	6	7	8	9
Gini coefficient	0.157	0.660	0.353	0.217	0.295	–0.445	–0.165	–0.230	0.050
Proportion of population with daily income below US$ 1.25a	–0.407	0.174	–0.011	–0.032	0.443	0.322	–0.513	0.490	0.005
Mortality rate among children aged < 5 years	–0.434	0.175	0.127	–0.015	0.104	–0.066	0.693	0.249	0.455
Per-capita volume of renewable internal freshwater resources	0.088	0.576	–0.523	0.357	–0.299	0.395	0.115	0.011	–0.036
Per-capita gross national income	0.440	0.124	0.157	–0.116	–0.167	–0.186	0.154	0.755	–0.313
Government effectiveness	0.316	0.051	0.555	–0.059	0.155	0.709	0.190	–0.153	–0.013
Per-capita level of official development assistance for sanitation and water	–0.169	–0.268	0.365	0.806	–0.282	0.000	–0.110	0.156	0.013
Percentage of the female population older than 25 years that had completed secondary education	0.280	–0.264	–0.328	0.396	0.697	–0.038	0.282	0.037	–0.142
Human development index	0.462	–0.107	–0.108	0.021	–0.027	0.013	–0.254	0.162	0.820
Eigenvalue	4.395	1.318	1.089	0.896	0.597	0.391	0.194	0.091	0.029
Proportion	0.488	0.146	0.121	0.010	0.066	0.044	0.022	0.010	0.003
Cumulative	0.488	0.635	0.756	0.855	0.922	0.965	0.987	0.997	1.000

US$: United States dollars.

^a As defined by the World Bank.¹⁸