Table 3.

Multinomial Logit Model 1 Results

Attribute	Parameter (Level)	Marginal Effect (95% CI)
	Opt-out constant	0.4 (–0.35 to 1.16)
Lung function	Modest deterioration (–5%)	–0.45a (–0.79 to –0.11)
	No change	Referent
	Modest improvement (+5%)	0.65b (0.36 to 0.95)
	Excellent improvement (+15%)	1.24b (0.77 to 1.72)
Need for IV antibiotics	No change	Referent
	One-half the number of IV courses	0.27a (0.1 to 0.44)
Abdominal symptoms	No change	Referent
	Improvement in symptoms	0.26a (0.02 to 0.51)
	Improvement in symptoms and a reduction in pancreatic enzymes	0.37b (0.17 to 0.58)
Life expectancy	No change	Referent
	Increases by 5 y	0.55b (0.27 to 0.82)
	Increases by 10 y	1.85b (1.45 to 2.26)
	Increases by 15 y	2.34b (1.83 to 2.85)
Overall quality of life	No change	Referent
	Good improvement (+10%)	0.31a (0.12 to 0.5)
	Excellent improvement (+20%)	0.65b (0.43 to 0.88)
Use of inhaled medicines	No change	Referent
	A modest reduction in time spent (–25%)	0.18a (0.01 to 0.35)
	A large reduction in time spent (–50%)	0.3a (0.11 to 0.48)
Physiotherapy/ACT	No change	Referent
	Time spent on physiotherapy is halved	0.19a (0.07 to 0.32)
	Able to fully stop physiotherapy	0.51b (0.26 to 0.75)
Model statistics	No. of observations, 1,236; McFadden R2, 0.32; LL, –924; AIC, 1,882; BIC, 1,988

ACT = airway clearance therapy; AIC = Akaike information criteria; BIC = Bayesian information criterion; LL = log likelihood.

^aP < .05.

^bP < .001.