. Author manuscript; available in PMC: 2015 Aug 4.

Published in final edited form as: J Occup Environ Med. 2013 Jul;55(7):846–850. doi: 10.1097/JOM.0b013e31828dc985

TABLE 2.

Mean Age, BMI, and Spirometry Results by X-Ray Small Opacity Category (n = 6328)^*

	X-Ray Small Opacity Profusion Category
	Category 0 (n = 6118)	Category 1 (n = 165)	Categories 2 and 3 (n = 45)
Age, y	46.7^B	52.5^A	52.0^A
BMI, kg/m²	30.2^A	29.0^A	28.9^A
PP FEV₁, %	96.6^A	90.6^B	88.7^B
PP FVC, %	99.1^A	97.0^A	93.0^B
PP FEF_25–75, %	93.9^A	79.5^B	81.0^B
PP PEF, %	100.7^A	94.4^B	92.0^B
FEV₁/FVC, %	76.5^A	72.2^B	73.9^B

A total of 45 cases of progressive massive fibrosis were excluded from this analysis.

One-way analysis of variance using Duncan statistics for testing; means with the same letter are not significantly different, ie, p > 0.05.

BMI, body mass index; FEV, forced midexpiratory flow rate; FEF, forced midexpiratory flow rate; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; PEF, peak expiratory flow; PP, percentage predicted; y, years.