Table 3 Summary of vital-sign estimation results for the day-time and night-time periods.

From: Non-contact physiological monitoring of post-operative patients in the intensive care unit

Period

Total recording time (h)

Private time (h)

Heart rate

Respiratory rate

   

Valid time

Estimated time

MAEa

rb

Valid time

Estimated time

MAEa

rb

   

(hours, %)c

(hours, %)d

(bpm)

 

(hours, %)c

(hours, %)d

(brpme)

 

Day-time

102.0 h

16.2 h

78.5 h, 77.0%

42.6 h, 41.8%

2.7

0.96

77.0 h, 75.5%

45.1 h, 44.2%

2.6

0.81

Night-time

131.5 h

15.0 h

115.2 h, 87.6%

60.4 h, 45.9%

2.5

0.98

112.8 h, 85.8%

74.7 h, 56.8%

2.3

0.82

Overall

233.5 h

31.2 h

193.7 h, 82.9%

103.0 h, 53.2%

2.5

0.98

189.7 h, 81.3%

119.8 h, 63.1%

2.4

0.82

  1. a Mean absolute error
  2. b Pearson r
  3. c Measurements were classed into day-time (7:00 am to 6:59 pm) and night-time (7:00 pm to 6:59 am). Percentage with respect to total recording time
  4. d Percentage with respect to valid camera time
  5. e breaths per minute