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Table 3 Comparison between days for all participant's Actiwatch night sleep measures (n = 32), KSS2 (n = 29) and KSD3, (n = 32) ratings.

From: Sleep and recovery in physicians on night call: a longitudinal field study

 

Night after day-time work

Night call

1st post-call night

2nd post-call night

Saturday night

Type III F-test

 

Mean

95% CI

Mean

95% CI

Mean

95% CI

Mean

95% CI

Mean

95% CI

P-value

AW sleep measures

           

Total sleep time (min)

364a

344-383

186

148-224

419b

385-452

399b

373-425

412b

393-431

< 0.001

Sleep efficiency1 (%)

90

88-92

86c

83-90

90

89-92

91

90-92

89d

88-91

0.045

KSS measures2

           

Sleepiness (mean)

5.6

4.9-6.2

---

 

6.1

5.4-6.8

5.5

4.8-6.3

5.1

4.2-6.0

0.206

Mental fatigue

6.1

5.6-6.6

---

 

7.1e

6.5-7.7

6.1

5.4-6.9

5.8

5.0-6.7

0.004

KSD measures3

           

SQI4

4.2

3.9-4.4

---

 

4.3

4.1-4.5

4.3

4.0-4.5

4.2

3.9-4.4

0.673

Sufficient sleep

3.0

2.7-3.4

---

 

2.9

2.5-3.3

3.1

2.7-3.6

3.6

3.2-4.0

0.052

Ease awakening

2.6f

2.2-3.0

---

 

2.8f

2.5-3.2

3.0

2.6-3.4

3.4

3.0-3.8

0.042

Well rested

2.6f

2.2-3.0

---

 

2.4g

2.0-2.8

3.0

2.6-3.4

3.3

2.9-3.7

0.013

  1. (Estimated means are presented).
  2. Note: 1. Sleep efficiency = the relative sleep time between sleep start and sleep end in %, (with awakenings during the night accounted for).
  3. 2. KSS (Karolinska sleepiness scale)-ratings are 1-10 (low-high). 3. KSD (Karolinska sleepiness diary)-ratings are scored 1-5, where 5 is the most positive. 4. SQI = (Sleep quality index) 1-5 (low quality-high quality), is the mean of 4 variables in the KSD.
  4. a Higher than night call, but lower than 1st and 2nd post-call nights and Saturday night (P's < 0.05). b Higher than night after day-time work and night call (P's < 0.05). c Lower than 1st and 2nd post-call nights. d Lower than 2nd post-call night (P's <0.05). e Higher than daytime work, 2nd post-call night, and Saturday. (P' < 0.01). f Lower than Saturday night (P's < 0.05). g Lower than Saturday night and 2nd post-call night (P's < 0.05).