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. Author manuscript; available in PMC: 2020 Feb 1.
Published in final edited form as: Psychiatr Serv. 2019 May 21;70(8):650–656. doi: 10.1176/appi.ps.201800504

Table 1. Descriptive statistics.

Analysis
Unplanned admissions Death ED presentations
Full sample
     N individuals 17,255 17,255 13,247
     During observation perioda
           Mean years 5.7 5.7 4.1
           Patients with at least one polypharmacy episode 2,228 2,228 1,548
           % patients with at least one polypharmacy episode 12.9 12.9 11.7
           Polypharmacy episodes per patient on polyph. 5.5 5.5 4.8
           Number of switches on/off polypharmacy per year 0.96 0.97 1.15
           Mean polypharmacy length 66 66 69
     During follow-up periodb
           Mean years 3.6 5.7 2.5
           Patients with at least one polypharmacy episode 1,515 2,228 1,068
           % patients with at least one polypharmacy episode 8.8 12.9 8.1
Sample of patients experiencing outcome
     N individuals 8,916 604 7,523
     During follow-up period
           Mean years 2.6 2.8 1.8
           Patients with at least one polypharmacy episode 704 52 511
           % patients with at least one polypharmacy episode 7.9 8.6 6.8
a

Observation period: from entry to the sample until the earliest of death, end of registration with practice, 31 March 2014.

b

Follow-up period: from entry to the sample until outcome occurs or censoring (end of observation period).