Table II. Demographic characteristics of study population, by pulmonary disease status (wide definition).

Pulmonary Disease	No		Yes		Total
Sex	No.	%	No.	%	No.	%
Male	3,057	98.9	35	1.1	3,092	100
Female	3,362	98.7	45	1.3	3,407	100
Ethnicity
White	4,670	98.5	69	1.5	4,739	100
Black	1,094	99.4	7	0.6	1,101	100
Hispanic	518	99.2	4	0.8	522	100
Other	137	100.0	0	0.0	137	100
Age at WT dx (months)
0 to < 24	1,994	99.6	8	0.4	2,001	100
≥ 24 to < 48	2,085	98.6	29	1.4	2,114	100
≥ 48	2,340	98.2	43	1.8	2,383	100
NWTS Study
1	546	97.3	15	2.7	561	100
2	772	98.8	9	1.2	781	100
3	2,219	98.4	35	1.6	2,254	100
4	2,882	99.3	21	0.7	2,903	100