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Table 2 Wearable remote measurement technology data availability stratified by baseline depression status

From: Remote Assessment of Disease and Relapse in Major Depressive Disorder (RADAR-MDD): recruitment, retention, and data availability in a longitudinal remote measurement study

Data Type Data Completiona Total Sample (n = 623) No/Some Baseline Depression Symptoms (n = 245) High Baseline Depression Symptoms (n = 378) X2 (P value)
   N (%) N (%) N (%)  
Heart Rate Any data 588 (94.4) 229 (93.4) 359 (95.0)  
No data 35 (5.6) 16 (6.5) 19 (5.0)  
0–25% 103 (16.5) 30 (12.2) 73 (19.3) 5.7 (0.13)
26–50% 83 (13.3) 32 (13.1) 51 (13.5)  
51–75% 111 (17.8) 47 (19.2) 64 (16.9)  
76 + % 326 (52.2) 136 (55.1) 190 (50.6)  
Steps Any data 587 (94.2) 229 (93.4) 358 (94.7)  
No data 36 (6.8) 16 (6.6) 20 (5.3)  
0–25% 120 (19.3) 38 (15.5) 82 (21.7) 6.5 (0.09)
26–50% 88 (14.1) 30 (12.2) 58 (15.3)
51–75% 116 (18.6) 46 (18.8) 70 (18.5)
76 + % 299 (48.0) 131 (53.5) 168 (44.4)
Sleep (Classic)b Any data 543 (87.2) 214 (87.3) 329 (87.0)
No data 80 (12.8) 31 (12.7) 49 (13.0)  
0–25% 485 (77.8) 200 (81.6) 285 (75.3) 3.9 (0.28)
26–50% 98 (15.7) 33 (13.5) 65 (17.2)  
51–75% 38 (6.1) 11 (4.5) 27 (7.1)  
76 + % 2 (0.3) 1 (0.4) 1 (0.3)  
Sleep Stages Any data 536 (86.0) 213 (86.9) 323 (85.4)  
No data 87 (14.0) 32 (13.1) 55 (14.6)  
0–25% 212 (34.0) 80 (32.7) 132 (34.9) 2.3 (0.52)
26–50% 134 (21.5) 58 (23.7) 76 (20.1)  
51–75% 152 (24.4) 63 (25.7) 89 (23.5)  
76 + % 125 (20.1) 44 (18.0) 81 (21.4)  
Activity Any data 580 (93.1) 226 (92.2) 354 (93.7)  
No data 43 (6.9) 19 (7.8) 24 (6.3)  
0–25% 358 (57.5) 126 (51.4) 232 (61.4) 14.1 (0.002)
26–50% 143 (23.0) 53 (51.6) 90 (23.8)  
51–75% 88 (14.1) 48 (19.6) 40 (10.6)  
76 + % 34 (5.5) 18 (9.4) 16 (4.2)  
Calorie intakec Any data 580 (93.1) 224 (91.4) 356 (94.2)  
No data 43 (6.9) 21 (8.6) 22 (5.8) 4.57 (0.21)
0–25% 122 (19.6) 40 (16.3) 82 (21.7)  
26–50% 87 (19.6) 31 (12.7) 56 (14.8)  
51–75% 113 (18.1) 44 (18.0) 69 (18.3)  
76 + % 301 (48.3) 130 (53.1) 171 (45.2)  
  1. aCalculated as the total number of days in which at least one data point has been provided. bClassic sleep data comprise sleep time, restlessness, and awake time. cData collected either via manual input about food/liquid intake from participant, or Fitbit automation from step count data (not possible to delineate source of data)