1999 Sample
194 schools
8 147 learners
Average age 15.5 years
Grade 8 tested
| Indicator | Mathematics | Science |
| Average achievement (standard error) | 275 (6.8) | 243 (7.8) |
| International benchmarks | ||
| % Learners below 400 | 86.3 | 85.9 |
| % Learners at or above 400 | 13.7 | 14.1 |
| % Learners at or above 475 | 5.4 | 6.8 |
| % Learners at or above 550 | 1.2 | 2.0 |
| % Learners at or above 625 | 0.2 | 0.5 |
| Average achievement by gender (standard error) | ||
| Boys (standard error) | 283 (7.3) | 253 (7.7) |
| Girls (standard error) | 267 (7.5) | 234 (9.2) |
| Average achievement by age in years (standard error) | ||
| 12-13 | 296 (21.4) | 266 (28.1) |
| 14-15 | 310 (8.6) | 289 (10.4) |
| 16-17 | 237 (5.6) | 196 (4.2) |
| 18-19 | 215 (7.9) | 173 (9.3) |
| 20-21 | 202 (10.6) | 174 (15.8) |
| Average achievement by test language (standard error) | ||
| Always/almost always spoken | 370 (11.7) | 368 (14.9) |
| Sometimes spoken | 259 (4.7) | 222 (5.8) |
| Never spoken | 224 (9.3) | 177 (5.4) |