Table 2.

Correlations Between Sleep Characteristics and Psychomotor Development

1. Scher79	No significant association with motor development
2. Scher et al.90	No significant association between motor development and sleep fragmentation
3. Montgomery-Downs et al.82	No significant association with motor development
4. Freudigman et al.81	Mean sleep period, r = −0.53 Sleep-wake transition time, r = 0.39 Quiet Sleep, r = −0.50
5. Anders et al.77	Wakefulness at birth, r = 0.21 Out Of Crib Time, r = 0.42

Significant correlations are provided between various sleep characteristics and psychomotor development scores for each study are provided.

Abbreviations: r = correlation coefficient