Table 2 Mean haemoglobin levels and prevalence of anaemia among study participants
From: Effect of green leafy vegetables powder on anaemia and vitamin-A status of Ghanaian school children
Factor | Treatment | |||
|---|---|---|---|---|
| Â | Control | CGLVP | Difference | P-value* |
|  | n (Mean ± SD) | n (Mean ± SD) |  |  |
Haemoglobin concentration (g/l) | ||||
 Baseline | 51 (116.9 ± 9.9) | 53 (117.6 ± 12.7) | 0.7 ± 2.5 | 0.747 |
 End-line | 47 (113.4 ± 8.5) | 51 (121.9 ± 13.5) | 8.5 ± 4.5 | 0.001 |
 Difference | −3.5 ± 1.4 | 4.3 ± 0.8 | 7.8a | 0.028 |
 P-value1 | 0.160 | 0.026 | – | – |
 Effectiveness (%) | −3.0 | 3.7 | 6.7 | – |
Prevalence of anaemia (haemoglobin conc. < 115 g/l), (%) | ||||
 Baseline | 37.3 | 41.5 | 4.2 | 0.657 |
 End-line | 57.5 | 33.3 | 24.2 | 0.024 |
 Difference | −20.2 | 8.2 | 28.4a | 0.011 |
 P-value1 | 0.294 | 0.030 | – | – |
 Effectiveness (%) | −54.2 | 19.8 | 74 | – |