Table 1. Spearman correlations between quantitative variables.
| Age | Academic achievement | Sleep time | TV/vide/DVD | Computer playing | Computer communicating | Computer for doing homework | Overall computer use | Passive videogames | Active videogames | Mobile for communicating | Mobile for playing | Overall sedentary screen media usage | |
| Age | 1 | ||||||||||||
| Academic achievement | −0.61 | 1 | |||||||||||
| (−0.69, −0.52) | |||||||||||||
| Sleep time | −0.97 | 0.55 | 1 | ||||||||||
| (−0.98, −0.96) | (0.45,0.64) | ||||||||||||
| TV/video/DVD | −0.16 | −0.5 | 0.15 | 1 | |||||||||
| (−0.29, −0.03) | (−0.59, −0.39) | (0.02,0.28) | |||||||||||
| Computer playing | −0.19 | −0.46 | 0.20 | 0.61 | 1 | ||||||||
| (−0.31, −0.06) | (−0.56, −0.35) | (0.07,0.32) | (0.52,0.69) | ||||||||||
| Computer communicating | 0.4 | −0.39 | −0.46 | 0.45 | 0.03 | 1 | |||||||
| (0.28,0.51) | (−0.50, −0.27) | (−0.56, −0.35) | (0.34,0.55) | (−0.10,0.16) | |||||||||
| Computer for doing homework | 0.31 | −0.37 | −0.38 | 0.47 | 0.22 | 0.91 | 1 | ||||||
| (0.19,0.42) | (−0.48, −0.25) | (−0.49, −0.26) | (0.36,0.57) | (0.09,0.34) | (0.88,0.93) | ||||||||
| Overall computer use | 0.26 | −0.48 | −0.33 | 0.61 | 0.44 | 0.88 | 0.91 | 1 | |||||
| (0.13,0.38) | (−0.58, −0.37) | (−0.44, −0.21) | (0.52,0.69) | (0.33,0.54) | (0.85,0.91) | (0.88,0.93) | |||||||
| Passive videogames | −0.25 | −0.35 | 0.28 | 0.44 | 0.92 | −0.26 | −0.07 | 0.14 | 1 | ||||
| (−0.37, −0.12) | (−0.46, −0.23) | (0.15,0.40) | (0.33,0.54) | (0.90,0.94) | (−0.38, −0.13) | (−0.20,0.06) | (0.01,0.27) | ||||||
| Active videogames | −0.73 | 0.05 | 0.71 | 0.52 | 0.74 | −0.28 | −0.07 | 0.06 | 0.77 | 1 | |||
| (−0.79, −0.66) | (−0.08,0.18) | (0.64,0.77) | (0.42,0.61) | (0.67,0.79) | (−0.40, −0.15) | (−0.20,0.06) | (−0.07,0.19) | (0.71,0.82) | |||||
| Mobile for communicating | 0.57 | −0.25 | −0.61 | 0.1 | −0.49 | 0.78 | 0.56 | 0.47 | −0.69 | −0.69 | 1 | ||
| (0.47,0.65) | (−0.37, −0.12) | (−0.69, −0.52) | (−0.03,0.23) | (−0.58, −0.38) | (0.72,0.83) | (0.46,0.64) | (0.36,0.57) | (−0.75, −0.61) | (−0.75, −0.61) | ||||
| Mobile for playing | −0.12 | −0.5 | 0.15 | 0.69 | 0.81 | 0.05 | 0.18 | 0.34 | 0.75 | 0.59 | −0.31 | 1 | |
| (−0.25,0.01) | (−0.59, −0.39) | (0.02,0.28) | (0.61,0.75) | (0.76,0.85) | (−0.08,0.18) | (0.05,0.31) | (0.22,0.45) | (0.69,0.80) | (0.50,0.67) | (−0.42, −0.19) | |||
| Overall sedentary screen media usage | 0.01 | −0.55 | −0.05 | 0.89 | 0.71 | 0.6 | 0.68 | 0.84 | 0.49 | 0.45 | 0.15 | 0.66 | 1 |
| (−0.12,0.14) | (−0.64, −0.45) | (−0.18,0.08) | (0.86,0.91) | (0.64,0.77) | (0.51,0.68) | (0.60,0.75) | (0.80,0.88) | (0.38,0.58) | (0.34,0.55) | (0.02,0.28) | (0.58,0.73) |
Data are correlations coefficients (95%CI).