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. 2014 Jan 7;7:926. doi: 10.3389/fnhum.2013.00926

Table 1.

Sample sizes and descriptive data for the variables included for each time point, with standard deviations in parenthesis.

Time 1
2
3
Group No music Music No music Music No music Music
Total (N) 280 59 225 48 48 17
Females (N) 135 33 110 30 22 10
Neuroimaging (N) 64 0 56 9 48 13
Music (h/week) 0 3.66 (4.98) 0 4.29 (4.35) 0 5.06 (4.98)
Physical activity (h/week) 1.00 (2.17) 1.42 (2.25) 1.41 (2.46) 1.29 (2.13) 1.71 (2.76) 1.18 (2.56)
TV/online/gaming (h/week) 20.14 (15.61) 20.29 (13.61) 26.34 (17.09) 24.31 (19.73) 33.48 (21.78) 23.47 (17.58)
Mother edu (years) 12.79 (2.39) 12.78 (2.26) 12.83 (2.28) 13.52 (2.52) 12.59 (2.47) 14.00 (2.82)
Father edu (years) 12.03 (1.92) 12.11 (2.28) 12.09 (2.15) 12.71 (2.75) 12.34 (2.52) 12.89 (3.65)
Age (years) 12.01 (4.49) 13.39 (4.38) 13.68 (4.05) 13.59 (3.92) 16.8 (4.69) 15.64 (5.76)
Dot matrix (raw score) 25.38 (7.44) 28.22 (5.95) 27.93 (7.31) 29.60 (6.55) 30.44 (6.46) 33.53 (6.88)
Digit recall (raw score) 13.98 (5.61) 16.50 (6.61) 15.99 (5.64) 16.81 (5.58) 17.94 (5.14) 20.53 (7.81)
Letters digit (raw score) 22.37 (12.16) 26.73 (11.87) 27.81 (10.77) 28.65 (11.50) 32.64 (9.45) 31.35 (10.87)
Raven (standardized) -0.13 (0.87) 0.44 (1.02) 0.18 (0.80) 0.42 (0.82) 0.50 (0.71) 0.70 (1.06)
Math (standardized)* -0.31 (0.91) 0.22 (0.92) -0.19 (0.99) -0.02 (0.97) 0.41 (0.71) 0.49 (0.81)
Reading (standardized)* -0.15 (0.97) 0.23 (0.86) -0.05 (1.01) 0.16 (0.87) 0.49 (0.57) 0.46 (0.55)

*The academic tests were assessed through ages 8–25 and thus the Ns for the table do not encompass these two variables but had a total of 273 at T1.