1. Home-visit intervention McLiden (1991) Lowitzer (1991) Sandow et al. (1981) Jenkins et al. (1982) Law et al. (1991)
2. Center-based intervention Lovass (1987) Barnett & Pezzino (1987) Taylor et al. (1984) Jago et al. (1984) Innocenti & Goetze (1991)
3. Home-visit versus center-based intervention Kysela et al. (1981) Innocenti (1 191) Barnett et al. (1988) aMean total of outcome measures. Study Quality Child Measures, ESa
4. Home-visit intervention Burkett (1982) Powell & Grantham-McGregor (1989)
5. Center-based intervention Washington & Osborne (1969)