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Table 5 Means and standard deviations of variables by problematic social networking site usage (PSNSU) group

From: Problematic social networking site usage and substance use by young adolescents

VARIABLE PSNSU Yes(n = 276)
Mean ± SD
PSNSU No (n = 796)
Mean ± SD
p
Age (yr) 12.62 ± 0.99 12.17 ± 0.98 < 0.001
Average school marks 6.97 ± 1.02 7.36 ± 0.98 < 0.001