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.