Objective: To determine in a systematic review, whether interventions for infant development that involve parents, improve neurodevelopment at 12 months corrected age or older.Study Design: Randomized trials were identified where an infant intervention was aimed to improve development and involved parents of preterms; and long-term neurodevelopment using standardized tests at 12 months (or longer) was reported.Result: Identified studies (n ¼ 25) used a variety of interventions including parent education, infant stimulation, home visits or individualized developmental care. Meta-analysis at 12 months (N ¼ 2198 infants) found significantly higher mental (N ¼ 2198) and physical (N ¼ 1319) performance scores favoring the intervention group. At 24 months, the mental (N ¼ 1490) performance scores were improved, but physical (N ¼ 1025) performance scores were not statistically significant. The improvement in neurodevelopmental outcome was not sustained at 36 months (N ¼ 961) and 5 years (N ¼ 1017).
Conclusion:Positive clinically meaningful effects (>5 points) are seen to an age of 36 months, but are no longer present at 5 years.