Table 1

Characteristics and possible biases (Kruskal-Wallis & Chi-square (X2)) of the sample (N=250)
Excluded Included,no Participated X2/p
N = 197 participation
(N,%) N = 227 N =250
(N,%) (N,%)
Age 41.4 (sd 21.0) 44.2 ( sd 19.9) 40.4 (sd 15.2) Kruskal-Wallis, ns
Age groups   > 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

Øiesvold et al.

Øiesvold et al. BMC Psychiatry 2013 13:13   doi:10.1186/1471-244X-13-13

Open Data