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. 2012 Nov 28;304(4):R296–R303. doi: 10.1152/ajpregu.00422.2012

Fig. 4.

Fig. 4.

Maturation of delta (1–4 Hz) mean frequency during NREM sleep (A) and REM sleep (B). In NREM sleep, delta mean frequency was unchanged between ages 6 and 10 yr and then increased steadily. In REM sleep, delta mean frequency increased across ages 6 to 18 yr.