Parameter estimates for the course of decline of per cent predicted maximum inspiratory pressure
| Parameter | Mean (SE) | 95% CI | p-value |
| b1 % | 58.1 (3.7) | 50.9, 65.3 | <0.001 |
| b2 % | −27.8 (4.5) | −36.6, −19.1 | <0.001 |
| b3 months | −7.8 (1.6) | −10.8, −4.7 | <0.001 |
| b4 months | 3.7 (1.2) | 1.3, 6.1 | 0.0027 |
b1: per cent predicted maximum inspiratory pressure before onset of decline of lung function; b2: magnitude of decline in predicted maximum inspiratory pressure to the lower asymptote, represented in the model as a negative number; b3: time (months) relative to initiation of noninvasive ventilation to the midpoint between the two asymptotes, also representing the inflection point of the per cent predicted maximum inspiratory pressure; b4: a timescale factor (months) that reflects the rapidity of decline of per cent predicted maximum inspiratory pressure.