Table 1 Technical error of measurement (TEM), coefficient of reliability (R) and intraclass correlation coefficient (ICC) for anthropometric measurements: inter-and intra-rater reliability of site lead anthropometrists and fieldworkers.

From: Statistical assessment of reliability of anthropometric measurements in the multi-site South African National Dietary Intake Survey 2022

PARAMETER	MEASURERS AND VOLUNTEERS (N = number of volunteers)	INTER-RATER					INTRA-RATER
PARAMETER	MEASURERS AND VOLUNTEERS (N = number of volunteers)	n^a	TEM^b	% TEM^c	R^d	ICC^e	n^a	TEM ^b	% TEM^c	R^d	ICC^e
Weight (kg)^f	Fieldworkers, all volunteers (N = 75)	321	0.291	0.923	>0.999	>0.999	300	0.215	0.645	>0.999	>0.999
	• 0 ≤ 2 years (N = 27)	110	0.198	2.173	0.994	0.995	90	0.182	2.000	0.995	0.995
	• 2–12 years (N = 26)	123	0.159	0.934	0.998	0.999	114	0.177	1.022	0.998	0.998
	• >12 years (N = 22)	88	0.458	0.603	0.999	0.999	96	0.277	0.368	>0.999	>0.999
	Site leads, all volunteers (N = 15)	48	0.097	0.320	>0.999	>0.999	48	0.075	0.260	>0.999	>0.999
	P-value^g: TEM: Site leads vs. fieldworkers	0.012*					<0.001*
Length/ height (cm)^f	Fieldworkers, all volunteers (N = 74)	315	0.920	0.855	0.999	0.999	296	0.851	0.757	>0.999	0.999
	• 0 ≤ 2 years (N = 28)	112	1.165	1.611	0.986	0.987	91	1.146	1.590	0.986	0.986
	• 2–12 years (N = 26)	123	0.542	0.522	0.996	0.997	114	0.723	0.695	0.994	0.994
	• >12 years (N = 20)	80	0.921	0.569	0.991	0.991	91	0.620	0.381	0.996	0.996
	Site leads, all volunteers (N = 15)	48	0.652	0.581	>0.999	>0.999	48	0.478	0.434	>0.999	>0.999
	P-value^g: TEM: Site leads vs. fieldworkers	0.240					0.009*
Mid-upper arm circumference (cm)^f	Fieldworkers, all volunteers (N = 70)	299	0.675	3.199	0.994	0.992	285	0.556	2.592	0.996	0.996
	• 0 ≤ 2 years (N = 26)	106	0.591	3.762	0.881	0.851	91	0.401	2.537	0.948	0.949
	• 2–12 years (N = 24)	113	0.582	3.475	0.926	0.920	104	0.376	2.228	0.975	0.975
	• >12 years (N = 20)	80	0.859	2.570	0.978	0.976	90	0.809	2.490	0.980	0.980
	Site leads, all volunteers (N = 15)	48	0.595	2.845	0.991	0.992	48	0.448	2.179	0.995	0.995
	P-value^g: TEM: Site leads vs. fieldworkers	0.418					0.185
Waist circumference (cm)^f	Fieldworkers (N = 20)	80	1.745	1.916	0.989	0.987	91	1.344	1.540	0.992	0.990
	Site leads, all volunteers (N = 4)	12	2.364	2.945	0.921	0.925	12	1.890	2.353	0.932	0.934
	P-value^g: TEM: Site leads vs. fieldworkers	0.014*					0.777
Calf circumference (cm)^f	Fieldworkers (N = 19)	73	0.903	2.360	0.921	0.901	84	0.793	2.102	0.944	0.945
	Site leads, all volunteers (N = 4)	12	0.618	1.601	0.889	0.896	12	0.363	0.942	0.951	0.952
	P-value^g: TEM: Site leads vs. fieldworkers	0.192					<0.001*

^an number of observations.
^bTEM Technical Error of Measurement.
^c%TEM = relative TEM = (TEM/mean)x100.
^dR = coefficient of reliability = 1 – ([Total TEM]² / SD²).
^eICC = intraclass correlation coefficient (One way random effects model).
^fMeasurement precision: weight 0.01 kg; rest 0.1 cm.
^gF-test; F = (site leads TEM)² / (fieldworkers TEM)²; N-1 degrees of freedom.
*p < 0.05: significant difference between TEM of site lead anthropometrists and fieldworkers.

Back to article page

Table 1 Technical error of measurement (TEM), coefficient of reliability (R) and intraclass correlation coefficient (ICC) for anthropometric measurements: inter-and intra-rater reliability of site lead anthropometrists and fieldworkers.

Search

Quick links