Table 5.

Diagnostic characteristics of the per cent predicted method, using the percentile method as a reference standard using Crapo et al (5–7) and Gutierrez et al (12) equations for women (n=1658)

Parameter	Crapo et al						Gutierrez et al
	Sen, %	Spe, %	PPV, %	NPV, %	LR+	LR–	Sen, %	Spe, %	PPV, %	NPV, %	LR+	LR–
FEV1	95	93	90	97	14	0.06	96	95	95	96	20	0.04
FVC	94	96	89	98	21	0.06	95	94	88	97	15	0.06
RV↓	100	83	36	100	6	0.00	100	86	31	100	7	0.01
RV↑	85	99	96	96	102	0.15	90	99	97	97	112	0.11
TLC↓	82	100	100	96	2172	0.18	86	99	98	96	137	0.15
TLC↑	78	100	100	98	2318	0.22	94	100	97	100	482	0.06
DLco	90	100	100	43	217	0.10	94	96	90	98	21	0.06

↓ Below normal;

↑ Above normal, for all other parameters, only below normal are presented; DLco Diffusing capacity of the lung for carbon monoxide; FEV₁ Forced expiratory volume in 1 s; FVC Forced vital capacity; LR+ Positive likelihood ratio; LR– Negative likelihood ratio; NPV Negative predictive value; PPV Positive predictive value; RV Residual volume; Sen Sensitivity; Spe Specificity; TLC Total lung capacity