Table 2.

(A) Age specific and generalizability ngram-MET bias and their 95% confidence intervals for all accelerometer sites by age. (B) Age specific and generalizability ngram-MET percent bias for all accelerometer sites by age. (C) Age specific and generalizability ngram-MET rMSE for all accelerometer sites by age.

(A)
	Age Specifica bias				Generalizabilityb bias
Accelerometer site	18–39 years (n = 33)	40–64 years (n = 33)	≥65 years (n = 33)	All (n = 33)	40–64 years (n = 33)	≥ 65 years (n = 33)
Ankle	0.010 (−0.078, 0.098)	−0.023 (−0.11, 0.069)	−0.021 (−0.13, 0.084)	−0.016 (−0.13, 0.095)	−0.088 (−0.18, 0.002)	−0.057 (−0.18, 0.062)
Hip	0.005 (−0.083, 0.094)	−0.002 (−0.087, 0.084)	−0.022 (−0.13, 0.087)	0.013 (−0.099, 0.13)	−0.065 (−0.16, 0.028)	−0.058 (−0.18, 0.062)
Wrist	0.002 (−0.087, 0.09)	−0.010 (−0.1, 0.084)	−0.014 (−0.12, 0.095)	−0.001 (−0.11, 0.11)	−0.009 (−0.099, 0.082)	−0.077 (−0.19, 0.041)
Hip + Wrist	0.004 (−0.084, 0.092)	−0.008 (−0.097, 0.081)	−0.022 (−0.13, 0.09)	−0.001 (−0.11, 0.11)	−0.130c,d (−0.22,−0.033)	−0.079 (−0.2, 0.04)
Ankle + Wrist	0.009 (−0.079, 0.097)	−0.009 (−0.1, 0.084)	−0.030 (−0.14, 0.077)	−0.015 (−0.13, 0.096)	−0.120 (−0.2,−0.028)	−0.055 (−0.17, 0.063)
Ankle + Hip	0.012 (−0.077, 0.1)	0.011 (−0.077, 0.099)	−0.033 (−0.14, 0.074)	−0.008 (−0.12, 0.1)	−0.160c,d (−0.25,−0.064)	−0.079 (−0.2, 0.041)
Ankle + Hip + Wrist	0.014 (−0.074, 0.1)	0.004 (−0.086, 0.094)	−0.034 (−0.14, 0.075)	−0.011 (−0.12, 0.1)	−0.190c,d (−0.28,−0.095)	−0.066 (−0.18, 0.053)
(B)
	Age Specifica percent bias				Generalizabilityb percent bias
Accelerometer site	18–39 years (n = 33)	40–64 years (n = 33)	≥65 years (n = 33)	All (n = 99)	40–64 years (n = 33)	≥65 years (n = 33)
Ankle	0.239	−0.529	−0.477	−0.375	−1.930	−1.290
Hip	0.123	−0.036	−0.506	0.297	−1.420	−1.320
Wrist	0.037	−0.220	−0.313	−0.012	−0.191	−1.740
Hip + Wrist	0.093	−0.187	−0.489	−0.027	−2.830d	−1.790
Ankle + Wrist	0.203	−0.195	−0.688	−0.333	−2.550d	−1.240
Ankle + Hip	0.272	0.250	−0.760	−0.183	−3.440d	−1.800
Ankle + Hip + Wrist	0.327	0.096	−0.777	−0.256	−4.120d	−1.500
(C)
	Age Specifica rMSE				Generalizabilityb rMSE
Accelerometer site	18–39 years (n = 33)	40–64 years (n = 33)	≥65 years (n = 33)	All (n = 33)	40–64 years (n = 33)	≥ 65 years (n = 33)
Ankle	0.85	0.87	0.98	1.05d	0.87	1.11d
Hip	0.86	0.81	1.02e	1.06d,e	0.89	1.12d
Wrist	0.86	0.89	1.02	1.03	0.87	1.10d
Hip + Wrist	0.85	0.84	1.04e	1.05d,e	0.93	1.11d
Ankle + Wrist	0.85	0.87	1.00	1.05d	0.85	1.10d
Ankle + Hip	0.86	0.83	1.00	1.07d,e	0.90	1.13d
Ankle + Hip + Wrist	0.86	0.85	1.02	1.06d,e	0.91	1.11d

^aAge Specific—model estimates developed and tested within age group classification.

^bGeneralizability—model developed on the young age group (18–39 years) and tested on the other age group classifications (40–64, ≥65 years).

^cSignificantly different from zero (p < 0.05).

^dSignificantly different than 18–39 years (p < 0.05).

^eSignificantly different than 40–64 years (p < 0.05).