Table 1.

Demographics and summary statistics for task-related behavior by sex: Means ± standard deviations (and ranges).

	Boys	Girls	Sex differences
Demographics	(n = 38)	(n = 41)
Age (in years)	13.9 ± 1.4	14.2 ± 1.7	t (75.9) = −1.1,
	(11.1–17.7)	(11.3–17.6)	p = 0.30
IQ (i.e., FSIQ-2 scores)	(n = 38)	(n = 41)	t (76.4) = −0.04,
	107.4 ± 10.8	107.6 ± 12.7	p = 0.97
	(81–127)	(79–132)
Puberty (i.e., mean PDS score)	(n = 36)	(n = 41)	t (74.8) = −5.60,
	2.4 ± 0.6	3.2 ± 0.6	p<.001
	(1.2–3.4)	(1.4–4.0)
Task-related behavior	(n = 39)	(n = 40)
Run completion time (in minutes) (Number of) Go decisions	2.3 ± 0.13	2.3 ± 0.14	t (3147.6) = −0.65,
	(2.0−2.6)	(2.0–2.7)	p = 0.51
	(n = 39)	(n = 40)	t (76.6) = 0.50,
	15.0 ± 6.8	14.3 ± 6.5	p = 0.62
	(2–27)	(1–32)
Stop decisions	(n = 39)	(n = 40)	t (76.8) = −0.38,
	23.5 ± 7.0	24.1 ± 6.8	p = 0.71
	(11–37)	(8–37)
Go decisions with Good outcomes	(n = 39)	(n = 40)	t (76.9) = 0.16,
	7.1 ± 3.4	7.0 ± 3.6	p = 0.87
	(0–14)	(0–17)
Stop decisions with Good outcomes	(n = 39)	(n = 40)	t (76.6) = −0.53,
	11.7 ± 4.1	12.2 ± 3.9	p = 0.60
	(5–20)	(4–19)
Go decisions with Bad outcomes	(n = 39)	(n = 40)	t (75.1) = 0.73,
	7.9 ± 4.0	7.3 ± 3.5	p = 0.47
	(0–15)	(1–15)
Stop decisions with Bad outcomes	(n = 39)	(n = 40)	t (77.0) = −0.16,
	11.8 ± 3.5	11.9 ± 3.6	p = 0.87
	(5–19)	(3–18)

FSIQ-2, Full-Scale Intelligence Quotient based on 2 subscales - Vocabulary and Matrix Reasoning - of the Wechsler’s Abbreviated Scale of Intelligence (WASI); PDS, Pubertal Development Scale