Table 2

Results for initial longitudinal models assessing BMI percentile change among children aged 2–3 in the NLSCY*

Parameter

Model A

Model B

Estimate

95% CI

Estimate

95% CI


Initial status

π0i

Intercept

β00

62.16

61.14 to 63.18

64.84

63.5 to 66.17

Rate of change

π1i

Intercept

β10

-1.36

-1.83 to -0.89

Random Effects

Level 2: In initial status

<a onClick="popup('http://www.biomedcentral.com/1471-2458/8/16/mathml/M1','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2458/8/16/mathml/M1">View MathML</a>

119.60

106.66 to 132.53

124.72

105.03 to 144.42

Covariance

σ01

-1.80

-7.07 to 3.48

In rate of change

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0.94

-1.14 to 3.02

Level 1: Within person

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975.73

946.37 to 1005.09

964.62

933.18 to 996.06

Goodness of Fit

-2 Log Likelihood

88140.50

88102.66


* NLSCY = National Longitudinal Survey of Children and Youth (Canadian); Estimates based on weighted data. Data used are for a cohort of children aged 2–3 at baseline (1994) and assessed bi-annually until 2002.

Oliver and Hayes BMC Public Health 2008 8:16   doi:10.1186/1471-2458-8-16

Open Data