Whole-Body versus Local DXA-Scan for the Diagnosis of Osteoporosis in COPD Patients

Table 4

Differences between patients without osteoporosis and osteoporosis on local DXA.

	Group I ($N=98$)	Group II ($N=32$)	$P$-value
Male/Female, %	64/36	38/62	.008
Age, years	64.0±9.2	61.7±9.2	.229
FEV1, % predicted	46.6±17.3	40.7±20.9	.110
GOLD I, %	5	6	.803
GOLD II, %	29	19	.272
GOLD III, %	31	16	.097
GOLD IV, %	36	59	.018
Arterial blood gas
pH	7.43±0.03	7.42±0.03	.267
PaCO2 (kPa)	5.38±0.72	5.71±0.85	.033
PaO2 (kPa)	9.62±1.28	9.00±1.51	.024
SO2 (%)	94.91±2.54	93.73±3.03	.032
BMI	25.88±3.93	25.11±4.03	.342
Low BMI, %	8	19	.093
Normal BMI, %	35	25	.309
High BMI, %	43	47	.691
Obese BMI, %	14	9	.474
6MWD, meters	443±128	354±146	.002

Group I = Patients without osteoporosis on total body DXA-scan and without osteoporosis on local DXA-scan.
Group II = Patients without osteoporosis on total body DXA-scan and with osteoporosis on local DXA-scan.
Results are presented as mean ± standard deviation or as % of the group.
Abbreviations: FEV1 = forced vital capacity in the first second; GOLD = Global Strategy for the Diagnosis, Management and prevention of COPD; COPD = chronic obstructive pulmonary disease; PaCO₂ = arterial blood carbon dioxide tension; PaO₂ = arterial blood oxygen tension; SO₂ = oxygen saturation in arterial blood; BMI = body mass index. 6MWD = 6 minutes walking distance.