Table 2.

Sensitivity and specificity: NWT algorithms >60 to >180 minutes using accelerometry versus diary.

NWT algorithma	ActivE study (N = 47)				KORA FF4 study (N = 559)
	number of NWT periods		sensitivityb	specificityb	number of NWT periods		sensitivityb	specificityb
	diary	accelerometry			diary	accelerometry
total time of assessment c
>60 min	50	378	0.72	0.00	476	1,535	0.64	0.08
>90 min	25	81	0.80	0.16	269	420	0.70	0.57
>120 min	18	34	0.83	0.54	199	284	0.76	0.74
>150 min	11	17	0.82	0.78	156	223	0.72	0.79
>180 min	8	10	0.88	0.92	134	192	0.72	0.82
waking d
>60 min	47	75	0.70	0.93	369	531	0.65	0.91
>90 min	22	34	0.76	0.97	214	257	0.70	0.97
>120 min	14	17	0.71	0.99	145	178	0.76	0.98
>150 min	7	8	0.57	0.99	112	132	0.68	0.98
>180 min	3	3	0.67	1.00	91	108	0.68	0.99
sleeping d
>60 min	3	299	1.00	0.59	22	868	0.90	0.77
>90 min	3	44	1.00	0.94	21	130	0.86	0.97
>120 min	3	16	1.00	0.98	21	81	0.86	0.98
>150 min	3	9	1.00	0.99	21	75	0.86	0.98
>180 min	3	6	1.00	1.00	20	66	0.85	0.99

NWT, non-wear time.

^aAlgorithms were applied to diary and accelerometry data to check for self-reported NWT periods >60, >90, >120, >150, and >180 minutes or NWT periods based on consecutive acceleration zero-counts >60, >90, >120, >150, and >180 minutes, respectively.

^bPeriods with an overlap between NWT according to diary and accelerometry of ≥50% were included in this analysis; number of epochs with an overlap of <50% was: in ActivE, waking, 90-min algorithm: 1; in KORA FF4, total time, 60- to 180-min algorithm: 30, 7, 8, 5, and 4, respectively; in KORA FF4, waking, 60- to 180-min algorithm: 14, 4, 5, 2, and 1, respectively; in KORA FF4, sleeping, 60-min algorithm: 1.

^cAnalyses were conducted from the first to the last recorded time point of assessment in the diary.

^dWaking and sleeping phases were derived from participants’ diary entries.

bold: algorithms showing high sensitivity and specificity in ActivE and KORA FF4, respectively.