TABLE 4

Correlations of Sleep Domain Data Collected at 6, 12, and 24 Months With the Same Domain at Later Time Point(s)

Correlation of Data at 6 Mo With That Collected Later at…Correlation of 12-Mo Data With Data Collected at…Correlation of 24-Mo Data With Data From
…12 mo…24 mo…36 mo…24 mo…36 mo…36 mo
Sleep onset latency0.35***0.17**0.19**0.39***0.24***0.41***
Sleep maintenance0.34***0.13*0.110.16**0.17**0.20**
24-h sleep duration0.44***0.30***0.29***0.35***0.20**0.37***
Naps0.17**−0.090.000.070.20**0.33***
Sleep location0.50***0.33***0.29***0.55***0.42***0.66***
Restlessness and vocalization0.34***0.23***0.19**0.32***0.27***0.32***
Nightmares/night terrors0.100.120.090.22***0.030.18*
Snoring0.37***0.19**0.23***0.31***0.23***0.29***
  • Two-tailed significance values for Spearman rank-order correlations: *P < .05, **P < .01, ***P < .001.