Table 5.

Pearson's correlations between the CIUS scores and depression, anxiety, subjective sleep, and well-being indices.

	CIUS-9	CIUS-7	CIUS-5
	r (p)	r (p)	r (p)
Depression symptoms as measured with the Patient Health Questionnaire-9	0.410 (<0.001)	0.411 (<0.001)	0.410 (<0.001)
Anxiety symptoms as measured with the Generalized Anxiety Disorder Scale 7	0.223 (<0.001)	0.216 (<0.001)	0.213 (<0.001)
Question on whether the participants considered their online behavior as problematic (“yes”/ “no”)	0.470 (<0.001)	0.467 (<0.001)	0.443 (<0.001)
Subjective sleep quality
Subjective sleep quality	0.242 (<0.001)	0.251 (<0.001)	0.254 (<0.001)
Sleep latency	0.118 (0.007)	0.127 (0.003)	0.125 (0.004)
Sleep duration	0.100 (0.022)	0.095 (0.029)	0.113 (0.010)
Habitual sleep efficiency	0.025 (0.566)	0.052 (0.238)	0.057 (0.195)
Sleep disturbances	0.174 (<0.001)	0.163 (<0.001)	0.159 (<0.001)
Use of sleeping medication	0.146 (0.001)	0.140 (0.001)	0.151 (0.001)
Daytime dysfunction	0.334 (<0.001)	0.333 (<0.001)	0.337 (<0.001)
Global Pittsburg Sleep Quality Index, total score	0.271 (<0.001)	0.279 (<0.001)	0.287 (<0.001)
Subjective psychological well-being
I have felt cheerful in good spirits	−0.237 (<0.001)	−0.233 (<0.001)	−0.235 (<0.001)
I have felt calm and relaxed	−0.174 (<0.001)	−0.188 (<0.001)	−0.181 (<0.001)
I have felt active and vigorous	−0.267 (<0.001)	−0.265 (<0.001)	−0.261 (<0.001)
I woke up feeling fresh and rested	−0.207 (<0.001)	−0.219 (<0.001)	−0.233 (<0.001)
My daily life has been filled with things that interest me	−0.234 (<0.001)	−0.243 (<0.001)	−0.246 (<0.001)
Well-Being Index (WHO-5)	−0.271 (<0.001)	−0.279 (<0.001)	−0.281 (<0.001)