Table 1: Pearson’s correlation coefficient between tonometers and at different altitudes

Paired sample		Correlation r		r significance		Cronbach s alpha (intraclass consistency correlation)
Acapulco Perkins–		0.514		0.001		0.669
Acapulco DCT Mexico Perkins–		0.753		<0.001		0.846
Mexico DCT Acapulco		0.566		<0.001		0.722
Perkins-Mexico Perkins
Acapulco DCT-Mexico DCT		0.554		<0.001		0.713