Table 4. Correlations between amylase copy numbers and geographic latitude and longitude.

Spearman rank-order	Copy number of
correlation coefficients rs	AMY1	AMY2A	AMY2B
Absolute latitude	−0.19 (p = 2 × 10−5)	−0.33 (p < 10−6)	−0.05 (p = 0.29)
Longitude	0.001 (p = 0.98)	0.001 (p = 0.98)	−0.098 (p = 0.035)
AMY2A copy number	0.21 (p = 9 × 10−6)
AMY2B copy number	−0.15 (p = 0.0015)	0.48 (p < 10−6)

Note significance for the two-tailed Spearman rank-order correlation test is shown in parenthesis.