Vitals
Vitals (Height and Weight)
About#
Height (or length if the participant cannot stand), weight and head circumference will be measured. Biological parents will also have height and head circumference measured whenever possible.
Administration
| Administration type | Case Report Form |
|---|---|
| Setting | In-Person |
| Duration | {} |
| Respondent | Child |
| Visits | Visits 1-3 |
| Ages | 0-18 years |
Quality Control#
Anthropometric values were screened for outliers using age-specific growth limits derived from published standards, including WHO Child Growth Standards, CDC Growth Charts, and other published literature. Upper and lower bounds were based on the widest values observed across girls and boys (e.g., some weight limits are based solely on female growth curves when they provided broader coverage). Bounds were extended from the 3rd–97th percentiles to cover the full 0–100 percentile range so as not to exclude extreme, but biologically plausible, values. Additional upward padding was also applied to head circumference limits to account for the increased head circumference common in this population (~5% larger than typical values).
Valid ranges of height and length measurements at different ages.
| Age Group Bin | Valid Range | Lower / Upper Bound Reference Source |
|---|---|---|
| 0–2 years | 40–105 | WHO 0–2 Girls / WHO 0–2 Boys |
| 2–5 years | 73–123 | WHO 2–5 Girls / WHO 2–5 Boys |
| 5–8 years | 90–145 | WHO 5–19 Girls / WHO 5–19 Boys |
| 8–11 years | 110–160 | |
| 11–15 years | 125–190 | |
| 15–18 years | 140–200 | |
| Adult (18+ years) | 130–215 | CDC 2–20 Girls / Bushby et al. (1992) |
Valid range of weight measurements at different ages.
| Age Group Bin | Valid Range | Lower / Upper Bound Reference Source |
|---|---|---|
| 0–2 years | 1–25 | WHO 0–2 Girls / WHO 0–2 Boys |
| 2–5 years | 7–35 | WHO 2–5 Girls (Both lower/upper) |
| 5–8 years | 10–45 | WHO 5–10 Girls (Both lower/upper) |
| 8–11 years | 17–57 | WHO 5–10 Girls / CDC 2–20 Girls |
| 11–15 years | 22–90 | CDC 2–20 Girls (Both lower/upper) |
| 15–18 years | 34–105 | CDC 2–20 Girls / CDC 2–20 Boys |
| Adult (18+ years) | — | — |
Valid range of head circumference at different ages.
| Age Group Bin | Valid Range | Lower / Upper Bound Reference Source |
|---|---|---|
| 0–2 years | 29–56 | WHO 0–2 Girls / WHO 0–2 Boys |
| 2–5 years | 42–58 | WHO 0–5 Girls / WHO 0–5 Boys |
| 5–8 years | 47–59 | Rollins et al. (2010) (Both lower/upper) |
| 8–11 years | 48–61 | |
| 11–15 years | 49–62 | |
| 15–18 years | 50–65 | |
| Adult (18+ years) | 50–66 | Bushby et al. (1992) (Both lower/upper) |