tendency towards significancep = .076
Boys who played an instrument were underrepresented in the lowest quartile of spelling performance: Only 27.5% of boys in the lowest quartile played an instrument whereas 61.5% of boys of the better quartiles were active musicians. Comparison between lowest quartile and all other quartiles combined proved a significant difference, X 2 (1) = 17.52, p < .0001; that turned into tendency towards significance after families without instruments were excluded, X 2 (1) = 6.86, p = .076.