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. 2014 Jul 16;144(9):1480–1487. doi: 10.3945/jn.114.194340

TABLE 4.

Regression equations to estimate recumbent length in children aged 0–3 y and height in children aged 2–5.9 y by using ULC, ULR, ULG, or arm span1

Surrogate measures (cm)
 Ethnicity
n Intercept ULC ULR ULG Arm span Age (mo) ln (t) Boy NHW NHB R2marginal SEE
Length (cm)
 Model 1 918 36.83 1.48* — — — 0.51* 5.42* 0.91* — — 0.95 2.62
 Model 2 864 39.84 — 1.09* — — 0.55* 5.90* 1.09* — — 0.95 2.75
 Model 3 741 38.15 — — 1.44* — 0.53* 5.01* 0.99* — — 0.92 2.73
 Model 4 784 16.30 — — — 0.67* 0.16* 2.64* — — −0.80* 0.97 1.99
Height (cm)
 Model 5 577 14.25 2.71* — — — 0.10† 10.7† — 1.17* — 0.87 3.18
 Model 6 571 28.80 — 2.29* — — 0.21† 7.34* — 1.22* — 0.85 3.43
 Model 7 573 13.93 — — 2.64* — 0.10* 11.0† — 0.89† — 0.88 3.11
 Model 8 551 21.39 — — — 0.71* 0.16* — — 0.98* −0.87* 0.94 2.07
1

Mixed-effects linear regression analysis using study center as a random effect. *P < 0.001, †P < 0.01. ln (t), natural log-transformed (age in mo + 1); NHB, nonHispanic black; NHW, nonHispanic white; R2marginal, coefficient of determination for fixed effects; ULC, ulnar length by caliper; ULG, ulnar length by grid; ULR, ulnar length by ruler.