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. 2011 Nov 16;6(11):e27826. doi: 10.1371/journal.pone.0027826

Figure 4. Grades of Regents Academy Students in Fun Club and of Those Who Did Not Participate.

Figure 4

These two groups within the Regents Academy did not differ in their grades during the previous year (t(39) = −0.966, p = 0.340) or first quarter (t(40) = 1.519, p = 0.137), before fun club was implemented, but a widening gap appeared in the second quarter and continued through the rest of the school year; Qtr 2: t(40) = 2.37, p = .020; Qtr 3: t(40) = 2.46, p = .017; Qtr 4: t(40) = 3.21, p = .002.