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Frequency of each NREM sleep episode at each age shows a decreased number of NREM sleep episodes at later ages.
| Age | 1st Episode | 2nd Episode | 3rd Episode | 4th Episode | 5th Episode | 6th Episode | 7th Episode | 8th Episode | 9th Episode | 10th Episode |
|---|---|---|---|---|---|---|---|---|---|---|
| 2Y | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 6 | 3 | 2 |
| 3Y | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 6 | 3 | 1 |
| 5Y | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 6 | 0 | 0 |
The probability of the given distribution across age groups of 9th NREM sleep episodes is p = 0.03.
