Table 1: Studies that demonstrated improvements in IQ with early childhood developmental intervention programs.
| Studies | Country | Interventions | Improvement in IQ |
|---|---|---|---|
| Aboud [15] | Bangladesh | Early childhood preschool program | 0.2 |
| Ade, et al. [16] | India | Preschool education through Anganwadi centers | 10.2 |
| Armecin, et al. [17] | Philippines | Philippine integrated early childhood development program | 0.553 SD increase |
| Cicchetti, et al. [19] | USA | Toddler parent psychotherapy | 4.95 |
| Garber [20] | USA | Preschool and family interventions | 10 |
| Grantham-Mc Gregor, et al. [21] | West Indies | Child development intervention program | 8.6 |
| Gutelius, et al. [22] | USA | Cognitive stimulation program | 8.1 |
| Jaramillo, et al. [23] | Cape Verde | Preschool program | 4.41 |
| Jaramillo, et al. [23] | Guinea | Preschool program | 7.27 |
| Love JM, et al. [24] | USA | Early head start program | 0.13 |
| Nordhov, et al. [26] | Norway | Modified mother infant transaction program | 7.2 |
| Olds, et al. [27] | USA | Home visiting by paraprofessionals and nurses program | 3.98 |
| Wasik, et al. [29] | USA | Early Intervention: Project CARE | 0.3 |
SD: Standard Deviation.