Association between Information and Communication Technology Usage and the Quality of Sleep among School-Aged Children during a School Week

Table 2

Unadjusted means of SDNN (ms) and rMSSD (ms) by ICT use.

Variables	ICT use		Mean difference (95% CI)	𝑃 value
	Low users; Mean (SD)	High users; Mean (SD)
SDNN	114.12 (27.12)	99.05 (27.23)	15.07 (1.06–29.09)	0.035
rMSSD	82.61 (27.14)	69.87 (25.27)	12.73 (−0.85–26.32)	0.066

SDNN: Standard deviation of NN interval; rMSSD: root mean square of successive difference; ICT: information and technology use; 𝑃: significant level.
Bold means statistically significant.