. Author manuscript; available in PMC: 2013 Feb 18.

Published in final edited form as: JAMA. 2011 Jul 27;306(4):394–401. doi: 10.1001/jama.2011.1025

Table 3.

Mean Number of Functional Limitations, Compensatory Dependency, and Services above Routine Associated with a Chronic Condition

	ELBW (n =181)		p value	NBW (n =115)		p value	Difference in Adjusted Means ELBW minus NBW: Estimates (95% CI)		Significant Predictors β(95% CI)
Age of child	8 yrs	14 yrs	8 vs 14 yrs	8 yrs	14 yrs	8 vs 14 yrs	8 yrs	14 yrs
Chronic Conditions^o
Mean ± SD	3.12±2.79	2.77±2.74	0.02	0.83±1.45	1.00±1.40	0.28	1.68(1.23,2.13)^a	1.19(0.76,1.62)^a	Neuro: 3.59(2.71,4.46)^a
Median (IQR)	3(1,5)	2(0,5)		0(0,1)	0(0,2)				SES: −0.35(−0.62,−0.08)^a
									Male: 0.69(0.24,1.13)^a
Functional Limitations^*
Mean ± SD	1.23±1.50	0.97±1.32	0.004	0.23±0.65	0.21±0.55	0.43	0.75(0.51,0.98)^a	0.53(0.34,0.72)^a	Neuro: 1.52(1.02,2.03)^a
Median (IQR)	1(0,2)	0(0,2)		0(0,0)	0(0.0)				SES: −0.21(−0.36,−0.06)^a
									Male: 0.33(0.11,0.55)^a
Compensatory Dependencies
Mean ± SD	0.49±0.61	0.55±0.64	0.24	0.27±0.57	0.46±0.74	0.004	0.19(0.05,0.33)^a	0.06(−0.11,0.23)
Median (IQR)	0(0,1)	0(0,1)		0,(0,0)	0,(0,1)
Service Needs Or Use
Mean ± SD	1.39±1.37	1.25±1.37	0.09	0.32±0.71	0.33±0.65	0.92	0.75(0.53,0.96)^a	0.60(0.39,0.82)^a	Neuro: 1.88(1.53,2.24)^a
Median (IQR)	1(0,2)	1(0,2)		0(0,0)	0(0,0)				SES: −0.17(−0.29,−0.04)^a
									Male: 0.28(0.07,0.48)^a

ELBW – Extremely low birth weight, NBW – Normal birth weight

Obtained from generalized estimating equations linear regression model with identity link function, simultaneously analyzing data from ELBW and NBW children at both time points (8 and 14 years) adjusting for socioeconomic status (SES), race, sex and neurosensory impairment

CI – Confidence interval

IQR – Inter Quartile Range

Interaction Age by Study Group, p=0.01

Interaction Age by Study Group, p=0.048

p<0.05