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Table 2 Relationship between depressive, manic, and total morbidity index and several characteristics of illness course (Wald tests for significance of fixed effects and covariates)

From: Stability of lithium treatment in bipolar disorder - long-term follow-up of 346 patients

Parameter Chi-square P
Total morbidity index
 Year of treatment; df = 19 19.847 0.404
 Year of treatment × group membership interaction; df = 19 17.658 0.545
 Number of episodes before index; df = 1 0.602 0.438
 Number of recurrences before index; df = 1 0.002 0.963
 Latency between onset of illness and start of lithium treatment; df = 1 1.991 0.158
Depressive morbidity index
 Year of treatment; df = 19 26.112 0.127
 Year of treatment × group membership interaction; df = 19 12.208 0.877
 Number of episodes before index; df = 1 0.304 0.581
 Number of recurrences before index; df = 1 0.773 0.379
 Latency between onset of illness and start of lithium treatment; df = 1 2.778 0.096
Manic morbidity index
 Year of treatment; df = 19 22.963 0.239
 Year of treatment × group membership interaction; df = 19 16.271 0.639
 Number of episodes before index; df = 1 0.305 0.581
 Number of recurrences before index; df =1 2.105 0.147
 Latency between onset of illness and start of lithium treatment; df = 1 0.013 0.908