Table 3

Correlations between socioeconomic indicators and the presence of metastastic disease at diagnosis, estimated survival and treatment refusal in patients with retinoblastoma in less-developed countries

Socioeconomic indicador	Study measures used in correlation analyses^*
	Metastastic disease at diagnosis			Estimate of survival			Treatment refusal
	R	R²	p Value	R	R²	p Value	R	R²	p Value
Human development index	0.727	0.529	<0.0001	0.876	0.767	<0.0001	0.725	0.526	<0.0001
Gross domestic product	0.330	0.109	0.107	0.544	0.296	<0.0001	0.559	0.313	0.002
Per capita government health expenditure	0.432	0.187	0.031	0.624	0.389	<0.0001	0.620	0.384	0.001
Per capita total health expenditure	0.381	0.145	0.0024	0.554	0.307	0.01	−0.59	0.350	0.005
Per cent 1-y-olds who received DPT vaccine	0.594	0.353	0.002	0.594	0.353	<0.0001	0.588	0.346	0.001
Nurse density	0.050	0.0025	0.814	0.324	0.105	0.044	0.318	0.101	0.113
Physician density	0.323	0.104	0.116	0.637	0.406	<0.0001	0.631	0.398	0.001
Infant mortality rate	0.686	0.471	<0.0001	0.844	0.712	<0.0001	0.693	0.480	<0.0001
Mortality rate of children <5 years	0.678	0.460	<0.0001	0.801	0.641	<0.0001	0.655	0.429	<0.0001
Maternal mortality rate	0.666	0.444	<0.0001	0.817	0.668	<0.0001	0.751	0.564	<0.0001
Adult literacy rate	0.368	0.136	0.07	0.592	0.351	<0.0001	0.610	0.372	0.001

↵* Pearson correlation coefficients (R and R²) were calculated using SPSS V.11.5 software.