Inverse-probability weighting and multiple imputation for evaluating selection bias in the estimation of childhood obesity prevalence using data from electronic health records

Table 1 Number and percentage of children with weight and length/height data in the electronic health record by age and one- and four-year periods

Age by December 2016 (years)		Weight and length/height within a one-year period (2016)		Weight and length/height within a four-year period (2013–2016)
Age by December 2016 (years)	N	n	%	n	%
0–12 months^a	5570	5387	96.7%	5387	96.7%
1 year^a	5953	5780	97.1%	5839	98.1%
2 years^a	5940	5624	94.7%	5898	99.3%
3 years^a	5874	4996	85.1%	5836	99.4%
4 years^a	6411	4992	77.9%	6307	98.4%
5 years	6541	1231	18.8%	6342	97.0%
6 years^a	6564	5119	78.0%	6332	96.5%
7 years	6593	1323	20.1%	6239	94.6%
8 years^a	6822	4999	73.3%	6415	94.0%
9 years	6605	1728	26.2%	6125	92.7%
10 years	6717	1923	28.6%	5979	89.0%
11 years^a	6397	3719	58.1%	5808	90.8%
12 years	6518	1978	30.4%	5684	87.2%
13 years	6588	1147	17.4%	5629	85.4%
14 years^a	6228	3628	58.3%	5243	84.2%
Total	95,321	53,574	56.2%	89,063	93.4%

^aThe Child Health Program recommends weight and height measurements at this age

ISSN: 1472-6947