Table 1. Correlations between facial and truncal pH.

Variable	Forehead	Nose	Chin	AW T	AW U	Front	Back
Forehead	1
Nose	0.530** (0.001)	1
Chin	0.742** (0.000)	0.637** (0.000)	1
AW T	0.979** (0.000)	0.659** (0.000)	0.846** (0.000)	1
AW U	0.723** (0.000)	0.597** (0.000)	0.841** (0.000)	0.795** (0.000)	1
Front	0.569** (0.000)	0.421* (0.012)	0.670** (0.000)	0.621** (0.000)	0.494** (0.003)	1
Back	0.516** (0.001)	0.298 (0.077)	0.527** (0.001)	0.537** (0.001)	0.356* (0.033)	0.922** (0.000)	1

Data presented as Pearson's correlation coefficients (p-value). AW: area-weight, T: T-zone, U: U-zone. ^*p<0.05, ^**p<0.01; correlation test.