Cohort baseline and emergent characteristics at diagnosis of bipolar disorder, according to use or nonuse of lithium.

1Earliest recorded value following diagnosis, as a proportion of those in whom status is recorded.215.7% of patients had missing data.36.1% of patients had missing data.445.1% of patients had missing data.5p-values: comparison of binary variables by adjusted χ2 test; continuous variables by Student’s t-test; multiple category variables by χ2 test adjusted for trend.6Index of Multiple Deprivation (IMD) based on practice post-code. 0 is least deprived, 4 is most deprived.