Table 1.

Attrition among African-Americans and Whites at levels 1–4

Level	African-American		White
	n	Dropped out (%)	n	Dropped out (%)
1	673	258 (39)	2,549	603 (24)
2	220	100 (46)	889	234 (26)
3	56	30 (56)	242	109 (45)
4	15	9 (60)	68	34 (54)

Note. Odds Ratio (O.R.) reflects odds of dropping out of the study for African-American vs. White race. Chi-square (χ²) Fisher exact tests null hypothesis of equal proportions (two-tailed).

Level 1: O.R. = 2.01 (1.68–2.40); χ² = 58.67, p <.0001

Level 2: O.R. = 2.27 (1.67–3.07); χ² = 28.77, p <.0001

Level 3: O.R. = 1.57 (0.87–2.83); χ² = 2.28, p =.138

Level 4: O.R. = 1.36 (0.45–4.16); χ² = 0.29, p =.781