Table 4.

Receiver Operating Characteristic Analysis for Key Respiratory Muscle Strength Parameters up to 3 Years of Follow-up for Ventilation-Free Survival: Noninvasive Respiratory Muscle Strength Parameters

Projected Time (mo)	Vital Capacity (% Predicted)				Sniff Nasal Inspiratory Pressure (% Predicted)				Maximal Static Inspiratory Mouth Pressure (% Predicted)
	Cutoff	AUC	Sensitivity	Specificity	Cutoff	AUC	Sensitivity	Specificity	Cutoff	AUC	Sensitivity	Specificity
3	78	0.837	0.62	0.96	49	0.877	0.61	0.95	51	0.731	0.46	0.96
6	81	0.894	0.61	0.97	52	0.859	0.55	0.95	54	0.796	0.49	0.97
9	85	0.906	0.63	0.97	71	0.865	0.50	0.96	64	0.813	0.44	0.97
12	88	0.892	0.61	0.97	71	0.847	0.53	0.96	64	0.822	0.46	0.97
15	105	0.848	0.37	0.98	82	0.846	0.48	0.97	83	0.807	0.27	0.98
18	105	0.868	0.37	0.96	82	0.845	0.52	0.97	83	0.844	0.30	0.98
24	106	0.854	0.41	0.98	85	0.865	0.55	0.98	84	0.849	0.32	0.98
36	111	0.883	0.46	0.98	88	0.981	0.83	0.98	93	0.909	0.31	0.98

Definition of abbreviation: AUC = area under the curve.

Data for the maximal static expiratory mouth pressure are shown in Table E2.