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Table 1 Characteristics and possible biases (Kruskal-Wallis & Chi-square (X 2)) of the sample (N = 250)

From: Classification of bipolar disorder in psychiatric hospital. a prospective cohort study

   Excluded
N = 197
(N, %)
Included, no participation
N = 227
(N, %)
Participated
N = 250
(N, %)
X 2 /p
Age 41.4 (sd 21.0) 44.2 (sd 19.9) 40.4 (sd 15.2) Kruskal-Wallis, ns
Age groups 18-39 yrs 122 (61.9%) 113 (49.8%) 139 (55.6%) X 2 = 26.64, p = .000
  40-59 33 (16.8%) 64 (28.2%) 81 (32.4%)  
  60 + 42 (21.3%) 50 (22.0%) 33 (12.0%)  
Females   92 (46.7%) 97 (42.7%) 111 (44.4%) ns
Married   51 (26.2%) 48 (21.3%) 71 (28.4%) ns
Norwegian ethnicity   136 (69%) 215 (94.7%) 241 (96.4%) X2 = 92.34, p = .000
Employment/income Paid work 34 (17.3%) 50 (22.0%) 74 (29.6%)  
  National insurance benefits 121 (61.4%) 128 (56.4%) 116 (46.9%) X2 = 12.81, p = .012
  Other 42 (21.3%) 49 21.6%) 60 (24.0%)  
Voluntary admission   124 (63.6%) 138 (61.1%) 193 (78.8%) X2 = 19.89, p = .000
Length of first stay   11.6 (sd 19.6) 31.0 (sd 37.8) 37.1(sd 48.3) Kruskal Wallis p < .001