Longitudinal Joint Modelling of Ordinal and Overdispersed Count Outcomes: A Bridge Distribution for the Ordinal Random Intercept

Table 1

The results of longitudinal joint modeling of severity and frequency of migraine attacks.

Variable	Estimate	Standard error	value	95% CI		OR
Ordinal process (severity)
Threshold 1	-6.293	0.957	<.0001	-8.169	-4.417	0.002
Threshold 2	-0.611	0.631	0.337	-1.848	0.626	0.543
Intervention	3.744	1.106	0.001	1.576	5.912	42.267
Week	-1.459	0.226	<0.001	-1.902	-1.016	0.232
Weekintervention	-4.449	0.658	<0.001	-5.739	-3.159	0.012
Random effect standard deviation	0.967	0.170
Count process (frequency)
Intercept	0.854	0.106	<.001	0.646	1.062	2.349
Intervention	0.166	0.148	0.266	-0.124	0.456	1.181
Week	-0.196	0.043	<.001	-0.280	-0.112	0.822
Weekintervention	-0.331	0.071	<.001	-0.470	-0.192	0.718
Random effect standard deviation	0.289	0.066
Correlation between the random effects	0.392	0.203	0.058	-0.006	0.790	1.480

OR: odds ratio; CI: confidence interval.