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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)