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Table 1 Mean (SD) Hours of Screen Use at Each Time Point, by Cohort

From: A latent growth curve model to estimate electronic screen use patterns amongst adolescents aged 10 to 17 years

Screen Use Measure Time 11 Time 22 Time 33 Time 44 Time 55 Time 66
Overall
Grade 5 3.05 (2.32) 2.65 (2.16) 2.60 (2.13) 2.60 (2.12) 2.89 (2.22) 3.02 (2.20)
Grade 7 3.92 (2.44) 3.78 (2.61) 3.67 (2.28) 3.89 (2.47) 3.92 (2.38) 4.04 (2.43)
Grade 9 4.95 (2.70) 4.53 (2.47) 4.57 (2.44) 4.66 (2.63) 4.63 (2.60) 4.48 (2.47)
Social Networking
Grade 5 0.88 (1.77) 0.86 (1.84) 0.76 (1.40) 0.93 (1.75) 1.18 (2.00) 1.30 (1.99)
Grade 7 1.70 (2.45) 1.71 (2.51) 1.58 (2.17) 1.72 (2.41) 1.82 (2.33) 1.93 (2.32)
Grade 9 2.52 (2.99) 2.17 (2.58) 2.20 (2.56) 2.28 (2.71) 2.48 (2.69) 2.19 (2.50)
Gaming
Grade 5 2.09 (2.28) 1.86 (2.26) 1.64 (2.06) 1.60 (1.94) 1.41 (2.02) 1.38 (1.97)
Grade 7 1.88 (2.16) 1.71 (2.43) 1.27 (1.85) 1.43 (2.10) 1.29 (2.24) 1.23 (2.10)
Grade 9 1.62 (2.33) 1.57 (2.37) 1.40 (2.22) 1.42 (2.43) 1.31 (2.57) 1.17 (2.29)
Web
Grade 5 1.46 (1.93) 1.35 (1.81) 1.26 (1.65) 1.25 (1.64) 1.46 (1.64) 1.34 (1.47)
Grade 7 1.73 (1.99) 1.90 (2.15) 1.64 (1.64) 1.84 (2.10) 1.78 (1.94) 1.79 (1.95)
Grade 9 2.09 (2.17) 2.04 (2.14) 1.87 (2.25) 2.17 (2.20) 2.42 (2.50) 2.15 (2.42)
Passive
Grade 5 2.45 (2.28) 2.18 (2.17) 2.09 (1.96) 2.14 (2.11) 2.06 (1.99) 2.04 (1.89)
Grade 7 2.73 (2.41) 2.80 (2.52) 2.35 (2.01) 2.47 (2.33) 2.41 (2.27) 2.48 (2.28)
Grade 9 3.02 (2.59) 2.84 (2.32) 2.69 (2.43) 2.73 (2.53) 2.59 (2.57) 2.56 (2.65)
  1. 1N = 590 to 652. 2N = 481 to 589. 3N = 461 to 539. 4N = 476 to 541. 5N = 373 to 483. 6N = 378 to 462