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Table 2 AFT and OR estimates for the adjusted model with log-normal random effects

From: A parametric model to jointly characterize rate, duration, and severity of exacerbations in episodic diseases

Covariate

Submodel

Between exacerbation

Duration

Severity

Zero-inflated

AFT\(^{\dagger }\) (95%CI)

AFT\(^{\dagger }\) (95%CI)

OR (95%CI)

OR (95%CI)

Mepolizumab (75 mg)

1.60 (1.19, 2.16) *

0.97 (0.83, 1.13)

1.25 (0.65, 2.39)

2.11 (0.90, 4.92)

Mepolizumab (100 mg)

1.38 (0.99, 1.92)

0.95 (0.82, 1.09)

1.66 (0.70, 3.94)

1.59 (0.62, 4.05)

Mepolizumab (250 mg)

2.18 (1.44, 3.29) *

0.94 (0.76, 1.16)

1.14 (0.40, 3.27)

2.62 (0.95, 7.18)

Mepolizumab (750 mg)

2.02 (1.38, 2.96) *

0.85 (0.72, 1.00) *

1.30 (0.53, 3.17)

1.42 (0.47, 4.33)

Age (in decades)

1.09 (0.98, 1.22)

1.02 (0.97, 1.08)

0.79 (0.63, 1.00) *

1.00 (0.78, 1.28)

Female

1.08 (0.86, 1.36)

1.05 (0.93, 1.18)

1.20 (0.65, 2.23)

0.37 (0.19, 0.73) *

FEV1 (liter)

0.81 (0.40, 1.66)

1.11 (0.77, 1.59)

0.89 (0.19, 4.26)

6.22 (0.90, 43.1)

Nasal polyp

1.15 (0.83, 1.60)

1.00 (0.85, 1.19)

0.94 (0.37, 2.36)

1.27 (0.51, 3.15)

ACQ score

0.90 (0.80, 1.00)

1.01 (0.96, 1.06)

0.97 (0.71, 1.33)

0.70 (0.52, 0.95) *

BMI

1.07 (0.89, 1.28)

1.14 (1.04, 1.26) *

1.94 (1.26, 3.00) *

0.63 (0.33, 1.19)

FEV1 reversibility (percentage)

1.27 (0.86, 1.89)

0.90 (0.74, 1.09)

0.94 (0.38, 2.34)

0.26 (0.04, 1.85)

Baseline eosinophil

0.77 (0.55, 1.08)

1.08 (0.95, 1.24)

2.01 (0.53, 7.67)

1.49 (0.79, 2.83)

History of smoking

1.13 (0.87, 1.46)

0.96 (0.85, 1.08)

1.31 (0.69, 2.48)

0.47 (0.19, 1.13)

Duration of asthma (in decades)

0.98 (0.90, 1.06)

1.03 (0.99, 1.07)

1.08 (0.85, 1.37)

1.00 (0.80, 1.26)

Baseline SCS daily dose

0.96 (0.88, 1.05)

1.08 (1.03, 1.14) *

1.32 (1.06, 1.65) *

0.18 (0.04, 0.92) *

Black/Hispanic v. White

0.76 (0.55, 1.06)

0.85 (0.72, 1.00) *

4.93 (2.39, 10.17) *

1.30 (0.42, 4.00)

Baseline IgE

1.04 (0.95, 1.15)

0.96 (0.91, 1.02)

1.02 (0.75, 1.37)

0.64 (0.34, 1.22)

No. of exacerbations year prior to study

0.47 (0.34, 0.64) *

0.73 (0.63, 0.86) *

1.65 (0.87, 3.16)

0.33 (0.07, 1.44)

\(N^{\ddagger }\)

1.10 (1.02, 1.19) *

1.04 (1.00, 1.08) *

1.20 (1.00, 1.43)

-

\(N_S^{\ddagger }\)

0.73 (0.58, 0.93) *

0.99 (0.89, 1.10)

-

-

  1. *Significant at 0.05 level AFT: accelerated failure time multiplicative factor (\(= \exp (\beta )\)); OR: odds ratio (\(= \exp (\beta )\)); FEV1: forced expiratory volume at one
  2. second; ACQ: asthma quality of life questionnaire; SCS: systemic corticosteroid; BMI: body mass index
  3. \(^{\dagger }\): ln the AFT model, each regression coefficient, when exponentiated, yields the multiplicative factor by which a one unit change in the
  4. covariate shortens/elongates the mean time to event
  5. \(^{\ddagger }\): Episode-specific covariates used in the model: N = number of previous exacerbations during follow-up; \(N_S\) = number of previous
  6. severe exacerbations during follow-up