Table 1.
Descriptive statistics.
| School 1 | School 2 | School 3 | School 4 | School 5 | ||
|---|---|---|---|---|---|---|
| Total participants | N | 3758 | 10,197 | 1979 | 2972 | 3818 |
| Sex | ||||||
| Male | N (%) | 1965 (52.3) | 6146 (60.3) | 1135 (57.3) | 1695 (57) | 2129 (55.8) |
| Female | N (%) | 1793 (47.7) | 4051 (39.7) | 844 (42.7) | 1277 (43) | 1689 (44.2) |
| IQ | ||||||
| Value | Mean (SD) | 107.2 (10.4) | 100.1 (10.1) | 85.4 (11.1) | 81.5 (10.8) | 76.6 (10.5) |
| Number of observations | Mean (SD) | 3.2 (1.5) | 3.0 (1.5) | 1.8 (1.0) | 2.1 (1.1) | 2.2(1.2) |
| Age range of observations | Mean (SD) | 6.6 (3.1) | 6.1 (3.0) | 2.7 (2.3) | 3.1 (2.1) | 3.9 (2.7) |
| Birth year | Mean (SD) | 1978 (7) | 1978 (7) | 1972 (4) | 1982 (5) | 1980 (6) |
| Range | 1962–1992 | 1961–1993 | 1961–1981 | 1969–1993 | 1964–1992 | |
| Observations by school year | ||||||
| Grade 1 | N (%) | 2552 (21.1) | 5598 (18.1) | 970 (27.0) | 1771 (28.7) | 2720 (32.9) |
| Grade 2 | N (%) | 2521 (20.9) | 5964 (19.3) | 755 (21.1) | 1528 (24.8) | 1965 (23.8) |
| Grade 4 | N (%) | 2460 (20.4) | 5910 (19.1) | 763 (21.3) | 1448 (23.5) | 1685 (20.4) |
| Grade 6 | N (%) | 2332 (19.3) | 5748 (18.6) | 648 (18.1) | 1422 (23.1) | 1235 (14.9) |
| Grade 7 | N (%) | 2146 (17.8) | 6401 (20.7) | 397 (11.1) | 0 | 617 (7.5) |
| Grade 9 | N (%) | 63 (0.5) | 1269 (4.1) | 54 (1.5) | 0 | 44 (0.5) |
| Observations by OLMAT level | ||||||
| Elementary I Level Form J | N (%) | 2552 (21.1) | 5598 (18.1) | 970 (27.0) | 1771 (28.7) | 2720 (32.9) |
| Elementary I Level Form K | N (%) | 2521 (20.9) | 5964 (19.3) | 755 (21.1) | 1528 (24.8) | 1965 (23.8) |
| Elementary II Level Form K | N (%) | 2460 (20.4) | 5910 (19.1) | 763 (21.3) | 1448 (23.5) | 1685 (20.4) |
| Intermediate Level Form J | N (%) | 4478 (37.1) | 12,149 (39.3) | 1045 (29.1) | 1422 (23.1) | 1852 (22.4) |
| Advanced Level Form J | N (%) | 63 (0.5) | 1269 (4.1) | 54 (1.5) | 0 | 44 (0.5) |
| Height cm | Mean (SD) | 140.0 (1.5) | 138.8 (1.5) | 130.0 (1.4) | 126.7 (1.3) | 126.4 (1.3) |
| Height Z-score | Mean (SD) | −0.2 (1.0) | −0.5 (1.0) | −1.4 (1.0) | −1.7 (0.9) | −2.1 (0.9) |
| Stunting prevalence (at first observation) | N (%) | 93 (2.5) | 590 (5.8) | 587 (29.7) | 1165 (39.2) | 2122 (55.6) |