Table 3.

Agreement of classification by discipline, along dimensions of severity, risk of progression and progression

A. Determined by Kappa statistic
Kappa calculation	n (pair)a	Average n (profile)b	Mean	Bootstrapped mean (95% CI)c
Severity
Between rheumatologists and pulmonologists	66	7.6	0.13	0.13 (0.00, 0.25)
Among rheumatologists	44	8.7	0.17	0.17 (−0.01, 0.45)
Among pulmonologists	17	6.6	0.20	0.18 (0, 0.25)
Risk of progression
Between rheumatologists and pulmonologists	66	6.6	0.61	0.59 (0.49, 0.69)
Among rheumatologists	44	8.3	0.70	0.66 (0.51, 0.86)
Among pulmonologists	17	5.9	0.48	0.4618 (0.26, 0.66)
Progression
Between rheumatologists and pulmonologists	66	3.1	0.56	0.51 (0.18, 0.70)
Among rheumatologists	44	3.5	0.78	0.70 (0.36, 0.95)
Among pulmonologists	17	3.1	0.29	0.24 (−0.00, 0.50)

B. Determined by χ2 analysis
χ2 calculation	Rheumatology	Pulmonology	P-value
Severityd
Clinical ILD	205 (93.2%)	114 (89.8%)	0.26
Subclinical ILD	15 (6.8%)	13 (10.2%)
Risk of progression
High risk	97 (45.3%)	55 (46.2%)	0.88
Low risk	117 (54.7%)	64 (53.8%)
Progression
Progressive	17 (18.9%)	11 (20.0%)	0.20
Stable	57 (63.3%)	40 (72.7%)
Improved	16 (17.8%)	4 (7.3%)

^aNumber of paired used to calculate kappa statistics.

^bAverage number of profile in each pair.

^c100 bootstrap datasets, randomly selecting based on profile with replacement.

^d‘Cannot tell’ was removed from this calculation.