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

Table 3

Means of SDNN (ms) and rMSSD (ms) by ICT use, adjusted for gender, age and BMI.

Variables	𝑁	SDNN			rMSSD
		Mean (SD)	𝐹 statistic	𝑃 value	Mean (SD)	𝐹 statistic	𝑃 value
ICT use
Low users	34	114.12 (27.12)	11.17	0.002	82.61 (27.14)	7.84	0.008
High users	27	99.05 (27.23)			69.87 (25.27)

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