. 2015 Aug 28;10(8):e0136165. doi: 10.1371/journal.pone.0136165

Table 4. Pearson correlations between test scores.

		Mathematics 2008–2009	Mathematics 2007–2008	Reading 2008–2009	Reading 2007–2008	Science 2008–2009
Mathematics 2008–2009	Pearson Correlation	1	.74^**	.64^**	.63^**	.70^**
Mathematics 2008–2009	N	3017	2653	2977	2645	2984
Mathematics 2007–2008	Pearson Correlation	.74^**	1	.62^**	.69^**	.65^**
Mathematics 2007–2008	N	2653	2675	2629	2642	2636
Reading 2008–2009	Pearson Correlation	.64^**	.61^**	1	.75^**	.68^**
Reading 2008–2009	N	2977	2629	2988	2622	2952
Reading 2007–2008	Pearson Correlation	.63^**	.69^**	.75^**	1	.68^**
Reading 2007–2008	N	2645	2642	2622	2669	2631
Science 2008–2009	Pearson Correlation	.70^**	.65^**	.68^**	.68^**	1
Science 2008–2009	N	2984	2636	2952	2631	3004

**. Correlation is significant at the 0.01 level (2-tailed).