Table 4. Socioeconomic factors as related to the cumulative outcome of mortality and lost to follow-up.

Mortality + lost to follow-up	Very low		Low		Acceptable
	No.	%	No.	%	No.	%
Living conditions score	26/33	79	62/131	47	24/93	26
Income	90/172	52	13/61	21	9/24	37
Parents’ educational level	37/41	90	58/129	45	17/87	19