. Author manuscript; available in PMC: 2006 May 1.

Published in final edited form as: Pediatrics. 2006 Apr;117(4):e769–e778. doi: 10.1542/peds.2005-1837

Table 1.

Demographic data at enrollment (mean ± s.d., or n (%)) for adenotonsillectomy and control subjects.

	Adenotonsillectomy (n = 78)	Control (n = 27)	p-value ^*
Age (years)	8.1 ± 1.8	9.3 ± 2.0	0.007
Gender (male)	41 (52.6)	19 (70.4)	0.11
Race (Caucasian)	66 (84.6)	20 (74.1)	0.22
Body mass index (Kg / meters²)	20.0 ± 5.1	18.9 ± 2.9	0.17
Stimulant use	1 (1.3)	0 (0.0)	1.00
Special services in school	15 (19.2)	2 (7.4)	0.15
Socioeconomic group ^**	2.6 ±1.0	2.5 ± 0.7	0.37
Subjects with 1 or more previous hospital admissions	22 (28.2)	11 (40.1)	0.23

Chi-square, Fisher's exact, or T-test, as appropriate

^**

As distinguished by 6 Hollingsworth categories