Simpson's Paradox: An Example From a Longitudinal Study in South Africa

Figures & data

Table 1. Number (and Percentage) of Subjects Whose Mothers Had Medical Aid

	Children Not Traced	Five-Year Group
Had Medical Aid	195 (16.6%)	46 (11.1%)
No Medical Aid	979 (83.4%)	370 (88.9%)
Total	1174 (100%)	416 (100%)

Table 2. Number (and Percentage) of Subjects Whose Mothers Had Medical Aid by the Race of the Participants

	White		Black
	Children Not Traced	Five-Year Group	Children Not Traced	Five-Year Group
Had Medical Aid	104 (82.5%)	10 (83.3%)	91 (8.7%)	36 (8.9%)
No Medical Aid	22 (17.5%)	2 (16.7%)	957 (91.3%)	368 (91.1%)
Total	126 (100%)	12 (100%)	1048 (100%)	404 (100%)