Table 3.

Impact of long-term respirator usage on physiologic measures and subjective symptoms

Factor	Blood pressure		CO2		O2		Heart rate
	β	P value	β	P value	β	P value	β	P value
BMI	−.003	NS	−.10	NS	−.07	<.05	2.0	<.001
Age	−.02	<.001	−.20	<.05	−.001	NS	.01	NS
Time	.003	NS	.20	<.01	.005	NS	−.30	NS
Years wearing N95	.02	<.001	.30	<.01	−.05	NS	−.20	NS
Day shift	−.20	<.05	−3.5	<.01	.80	<.05	−2.7	NS

Factor	Headache		Lightheadedness		Visual challenge
	β	P value	β	P value	β	P value
BMI	.10	<.001	.02	<.05	.03	<.001
Age	.06	<.01	−.01	=.01	.06	<.001
Day 2	1.2	<.001	.008	NS	.06	NS
Time	.07	<.001	.01	<.01	.005	NS
Years wearing N95	−.10	<.001	−.01	NS	−.08	<.001
Day shift	1.3	<.001	.40	<.001	.01	NS

BMI, body mass index; NS, not significant.