Table 1.

Descriptive statistics of the IGF estimations and IGF reliability intervals from 64-channel gel electrode data.

		Descriptive Statistics				Reliability Intervals *
	IGF Extraction Condition	Mean IGF (Hz)	IGF Range (Hz)	Mean Reliability	Reliability Range	Singular IGF (n)	High (n)	Medium (n)	Low (n)	No IGF (n)
15 channels	Electrodes kept, down-up	37 (±4)	30–47	0.67 (±0.16)	0.27–0.98	15	47	17	1	0
	Electrodes averaged, down-up	37 (±4)	30–47	0.89 (±0.12)	0.47–1.0	62	17	1	0	0
	Electrodes kept, down	37 (±5)	31–53	0.59 (±0.16)	0.29–0.95	11	42	26	1	0
	Electrodes kept, up	37 (±3)	30–45	0.66 (±0.13)	0.32–0.97	10	59	11	0	0
	Electrodes averaged, down	38 (±5)	31–52	0.83 (±0.15)	0.51–1.0	47	33	0	0	0
	Electrodes averaged, up	37 (±3)	30–46	0.89 (±0.13)	0.58–1.0	62	18	0	0	0
3 channels	Electrodes kept, down-up	37 (±4)	30–49	0.71 (±0.18)	0.38–1.0	28	40	12	0	0
	Electrodes averaged, down-up	36 (±4)	30–49	0.88 (±0.14)	0.47–1.0	58	21	1	0	0
	Electrodes kept, down	37 (±5)	31–52	0.64 (±0.18)	0.34–0.98	18	41	21	0	0
	Electrodes kept, up	37 (±4)	30–50	0.69 (±0.16)	0.32–0.99	22	47	11	0	0
	Electrodes averaged, down	38 (±6)	30–52	0.82 (±0.16)	0.48–1.0	48	30	2	0	0
	Electrodes averaged, up	37 (±4)	30–51	0.87 (±0.13)	0.42–1.0	57	22	1	0	0

* Singular: >0.8; high reliability: 0.51–0.8; medium reliability: 0.31–0.5; low reliability: 0.16–0.3; no IGF: ≤0.15.