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. Author manuscript; available in PMC: 2022 Sep 1.
Published in final edited form as: Sleep Med. 2021 Jun 28;85:45–53. doi: 10.1016/j.sleep.2021.06.028

Table 3.

Incremental Validity of the Sleep Regularity Questionnaire.

PHQ-2 GAD-2 Physical Health VAS
ΔR2 f 2 ΔR2 f 2 ΔR2 f 2
Pittsburgh Sleep Quality Index
 Sleep Continuity Regularity 0.004 0.004 0.003* 0.003 0.001 0.001
 Circadian Regularity 0.160* 0.190 0.003* 0.003 0.021* 0.021
Insomnia Severity Index
 Sleep Continuity Regularity 0.002 0.002 0.000 0.000 0.000 0.000
 Circadian Regularity 0.006* 0.006 0.003* 0.003 0.018* 0.018

Note: PHQ-2 = Patient Health Questionnaire – 2 item; GAD-2 = Generalized Anxiety Disorder – 2 item; Physical Health VAS = 0 – 100 visual analog scale.

*

p < .05.