Table 1.

Subject demographics.

Variable	Baseline disease			p
	COPD n (23)	ILD n (61)	Healthy n (16)
Age	67.1	58.1	54.4	0.007
Gender (male)	39%	30%	46%	0.363
In use of oxygen	26%	15%	0%	< 0.001
Oxygen saturation
Apple watch	95.1	95.8	97.4	0.025
Oximeter 1	94.8	94.8	97.4	< 0.001
Oximeter 2	94.2	92.5	96.4	0.007
Heart rate
Apple watch	81.9	82.8	70.6	0.009
Oximeter 1	81.1	83.2	69.8	0.005
Oximeter 2	79.2	83.0	68.5	0.021

ILD Interstitial lung disease, COPD chronic obstructive pulmonary disease.