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. 2016 Apr 13;11(4):e0153663. doi: 10.1371/journal.pone.0153663

Table 2. Descriptive Statistics and Correlations Between the Predictors and Academic Performance Measures.

Variable M SD 1 2 3 4 5 6 7
Admission tests
1. Trial-studying test 29.7 5.2 .81
2. Math test 16.6 4.7 .30 [.23,.37] .76
3. English test 13.7 3.3 .43 [.37,.49] .21 [.14,.28] .70
Prior educational performance
4. HSMG 6.7 0.44 .45 [.33,.55] .36 [.23,.47] .29 [16,.41]
Academic performance
5.First course grade 6.6 1.4 .56 [.50,.61] .20 [.12,.27] .34 [.27,.41] .55 [.45,.64]
6. FYMG 6.6 1.3 .49 [.43,.55] .29 [.22,.36] .25 [.18,.32] .52 [.41,.61] .75c [.71,.78]
7. Credits 46.0 20.2 .39 [.32,.55] .20 [.13,.27] .16 [.09,.23] .30 [.17,.42] .62c [.57,.67] .82 [.79,.84]
8. Drop-outa 0.20b -.32 [-.39,-.25] -.15 [-.22,-.08] -.13 [-.20,-.05] -.22 [-.35,-.09] -.47 [-.53,-.41] -.64 [-.70,-.58] -.83 [-.85,-.81]

HSMG, high school mean grade; FYMG, first-year mean grade. Internal consistency coefficients are on the diagonal (Cronbach’s alfa). All correlations were significant with p < .01.

95% confidence intervals for the population correlation ρ are between brackets.

aPoint-biserial correlations.

bProportion.

cFor these correlations, results on the first course were not included in the calculation of FYMG and credits.