Guide to evaluating performance of prediction models for recurrent clinical events

Table 6 Z-score statistics based on the predictions from the four models

Prediction bias (n)	Non-smoker	Current smoker	Ex-smoker
Negative binomial
Female, previous exacerbations	0.17	0.21	0.21
Male, previous exacerbations	0.12	0.24	0.14
Female, no previous exacerbations	− 0.02	− 0.03	0.02
Male, no previous exacerbations	0.01	0.05	0.00
Zero-inflated negative binomial
Female, previous exacerbations	0.16	0.18	0.19
Male, previous exacerbations	0.12	0.24	0.14
Female, no previous exacerbations	− 0.01	− 0.01	0.03
Male, no previous exacerbations	− 0.01	0.04	−0.01
Andersen-Gill
Female, previous exacerbations	1.07	1.34	1.25
Male, previous exacerbations	0.72	0.96	0.91
Female, no previous exacerbations	0.61	0.77	0.75
Male, no previous exacerbations	0.43	0.57	0.54
PWP
Female, previous exacerbations	1.06	1.39	1.25
Male, previous exacerbations	0.73	0.92	0.91
Female, no previous exacerbations	0.61	0.76	0.73
Male, no previous exacerbations	0.44	0.56	0.55

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