Prepare cardio metabolic biomarker indicies

[conig]

Construct	Variable	Measure	Notes
Anthropometry and body composition	Waist Circumference	Waist circumference was measured using a Lufkin executive steel tape. Average of two measurements was used; if values differed by >1.0 cm, a third measurement was taken and the average of two closest measurements was used.
	Waist-to-height ratio	Bioelectrical Impedance Analysis (BIA)
	BMI	Body Mass Index (kilograms/metre square)
	Body Mass Index z-score	Body Mass Index z-score (Centers for Disease Control and Prevention)
	Total body fat %	Bioelectrical Impedance Analysis (BIA)

The mean age- and sex-specific z scores (Stavnsbo et al. 2018) for levels of triglycerides, inverted HDL cholesterol, and glucose, the mean of systolic and diastolic blood pressure, and waist circumference (Alberti et al., 2009). Children at risk of metabolic syndrome were identified as those with a z score of at least 0.39 (Stavnsbo et a

This will require:

• [x] Determining age-specific means and sds for each variable and age-sex group
• [ ] Calculate z scores (obs - normed mean) / normed SD
• [ ] Averaging those z scores into a single var.

[conig]

1-s2.0-S0021915018314229-main.pdf Taking norms from Table 1 of the attached