Table 1. Means, standard deviations and correlations among study variables.

Measure	1	2	3	4	5	6	7	8	9	10	11
1 RSAB	–
2 RSAR	−0.07	–
3 Sleep minutes	0.05	0.07	–
4 Sleep activity	−0.01	−0.12†	−0.42**	–
5 Minutes awake after sleep onset	−0.07	−0.14*	−0.60**	0.74**	–
6 Long wake episodes	−0.08	−0.12†	−0.62**	0.70**	0.95**	–
7 Age	−0.03	−0.16**	−0.17**	0.03	0.06	0.06	–
8 Sex	0.10	−0.11†	−0.11†	0.16*	0.09	0.08	0.02	–
9 Race	0.09	−0.10	−0.10	−0.25**	−0.10	−0.10†	−0.06	−0.04	–
10 BMI	−0.14*	−0.21**	−0.21**	0.05	0.16*	0.14*	0.07	0.00	0.12*	–
11 Asthma	−0.00	−0.05	−0.05	0.11†	0.13*	0.11†	0.09	0.05	0.06	0.04	–
Mean	7.07	−0.29	445.42	40.62	58.38	3.46	10.41	–	20.06	–
SD	1.16	0.69	45.94	13.08	36.50	2.28	0.67	–	5.07	–

^†<0.10.

^*P < 0.05.

^**P < 0.01.

RSAB, respiratory sinus arrhythmia at baseline; RSAR, respiratory sinus arrhythmia reactivity; BMI, body mass index.

Females were coded as 0 and males as 1. European Americans were coded as 0 and African Americans as 1. Asthma was coded as 1 for children with diagnosed asthma. Age is examined in years.