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Table 1 Participant characteristics

From: Development and validation of the suicidal behaviours questionnaire - autism spectrum conditions in a community sample of autistic, possibly autistic and non-autistic adults

   Autistic Possibly autistic Combined autistic/possibly autistic Non-autistic
N = 308 N = 113 N = 421 N = 268
N (%)/mean (SD)
Questionnaires AQ 22.86 (3.76) 20.17 (4.57) 22.14 (4.16) 9.45 (5.67)
  CAT-Q 129.02 (23.97) 123.5 (21.11) 127.56 (23.34) 83.31 (25.97)
  Thwarted belongingness 36.84 (10.65) 35.71 (10.81) 36.53 (10.69) 23.09 (11.26)
  Perceived burdensomeness 19.17 (9.21) 16.69 (8.51) 18.5 (9.09) 10.21 (5.68)
  ASA-A 37.82 (10.74) 32.49 (11.24) 36.4 (11.11) 19.35 (11.18)
  PHQ-9 14.29 (7.58) 12.92 (7.28) 13.92 (7.52) 7.37 (6.47)
Demographics Sex 82 (26.62) 29 (25.66) 111 (26.37) 85 (31.72)
  Gender 83 (26.95) 33 (29.2) 116 (27.55) 83 (30.97)
  Identify with a different gender than birth sex 51 (16.56) 17 (15.04) 68 (16.15) 8 (2.99)
  Age (years) 39.71 (13.34) 40.34 (13.55) 39.88 (13.81) 41.57 (14.05)
  UK residency 243 (78.9) 73 (64.6) 316 (75.06) 182 (67.91)
Ethnicity Asian 6 (1.95) 5 (4.42) 11 (2.61) 6 (2.24)
  Black or African or Caribbean 2 (0.65) 3 (2.65) 5 (1.19) 3 (1.12)
  Latinx 0 (0) 0 (0) 0 (0) 0 (0)
  Middle eastern or arab 2 (0.65) 0 (0) 2 (0.48) 2 (0.75)
  White or Caucasian 287 (93.18) 99 (87.61) 386 (91.69) 247 (92.16)
  Other ethnic group 12 (3.9) 5 (4.42) 17 (4.04) 10 (3.73)
  Prefer not to answer 2 (0.65) 2 (1.77) 4 (0.95) 1 (0.37)
Living arrangements Living with flatmate(s) 9 (2.92) 9 (7.96) 18 (4.28) 15 (5.6)
  Living independently 88 (28.57) 23 (20.35) 111 (26.37) 50 (18.66)
  Living with a partner and/or dependent(s) 131 (42.53) 60 (53.1) 191 (45.37) 179 (66.79)
  Living with parents 55 (17.86) 11 (9.73) 66 (15.68) 20 (7.46)
  Living with friend(s) 7 (2.27) 5 (4.42) 12 (2.85) 2 (0.75)
  Living with a carer 1 (0.32) 1 (0.88) 2 (0.48) 0 (0)
  Living in supported accommodation 0 (0) 0 (0) 0 (0) 0 (0)
  Other 14 (4.55) 3 (2.65) 17 (4.04) 2 (0.75)
Employment status Employed full time 93 (30.19) 47 (41.59) 140 (33.25) 154 (57.46)
  Employed part time 66 (21.43) 19 (16.81) 85 (20.19) 51 (19.03)
  Volunteering full time 1 (0.32) 1 (0.88) 2 (0.48) 1 (0.37)
  Volunteering part time 32 (10.39) 7 (6.19) 39 (9.26) 12 (4.48)
  Student full time 36 (11.69) 18 (15.93) 54 (12.83) 28 (10.45)
  Student part time 33 (10.71) 7 (6.19) 40 (9.5) 14 (5.22)
  Retired 14 (4.55) 6 (5.31) 20 (4.75) 21 (7.84)
  Unemployed looking for work 11 (3.57) 9 (7.96) 20 (4.75) 7 (2.61)
  Unemployed not looking for work 10 (3.25) 10 (8.85) 20 (4.75) 7 (2.61)
  Unable to work due to illness or disability 90 (29.22) 18 (15.93) 108 (25.65) 7 (2.61)
Education Home 11 (3.57) 1 (0.88) 12 (2.85) 4 (1.49)
  Mainstream 296 (96.1) 107 (94.69) 403 (95.72) 259 (96.64)
  Special 12 (3.9) 1 (0.88) 13 (3.09) 2 (0.75)
  Other 8 (2.6) 6 (5.31) 14 (3.33) 7 (2.61)
  University degree 206 (66.88) 79 (69.91) 285 (67.7) 221 (82.46)
ASC subtype Asperger syndrome 150 (48.7)    
  High functioning autism 29 (9.42)    
  Atypical autism 1 (0.32)    
  Autism 32 (10.39)    
  ASC 60 (19.48)    
  Classic autism 2 (0.65)    
  PDD-NOS 1 (0.32)    
  Other 30 (9.74)    
  Age of ASC diagnosis 34.58 (14.12)    
  Clinician confirmed 308 (100)    
Developmental conditions  >  = 1 Co-occurring Developmental Condition 86 (27.92) 16 (14.16) 102 (24.23) 26 (9.7)
  Dyspraxia 24 (7.79) 4 (3.54) 28 (6.65) 5 (1.87)
  Learning disability 3 (0.97) 2 (1.77) 5 (1.19) 1 (0.37)
  Learning difficulty 1 (0.32) 0 (0) 1 (0.24) 0 (0)
  Dyscalculia 6 (1.95) 0 (0) 6 (1.43) 2 (0.75)
  Dyslexia 25 (8.12) 2 (1.77) 27 (6.41) 10 (3.73)
  ADHD 42 (13.64) 9 (7.96) 51 (12.11) 15 (5.6)
  Developmental delay 5 (1.62) 0 (0) 5 (1.19) 0 (0)
  Other 10 (3.25) 0 (0) 10 (2.38) 1 (0.37)
Current mental health/other conditions  >  = 1 current mental health/other condition 220 (71.43) 61 (53.98) 281 (66.75) 86 (32.09)
  Depression 154 (50) 45 (39.82) 199 (47.27) 64 (23.88)
  Anxiety 184 (59.74) 50 (44.25) 234 (55.58) 57 (21.27)
  OCD 29 (9.42) 3 (2.65) 32 (7.6) 5 (1.87)
  Bipolar 14 (4.55) 3 (2.65) 17 (4.04) 3 (1.12)
  Personality disorder 20 (6.49) 9 (7.96) 29 (6.89) 8 (2.99)
  Schizophrenia 0 (0) 0 (0) 0 (0) 1 (0.37)
  PTSD 55 (17.86) 15 (13.27) 70 (16.63) 8 (2.99)
  Tourette's syndrome/tic disorder 6 (1.95) 0 (0) 6 (1.43) 1 (0.37)
  Anorexia 12 (3.9) 1 (0.88) 13 (3.09) 2 (0.75)
  Bulimia 5 (1.62) 1 (0.88) 6 (1.43) 3 (1.12)
  Other 30 (9.74) 5 (4.42) 35 (8.31) 4 (1.49)
  1. AQ = Autism Spectrum Quotient; CAT-Q = Camouflaging Autistic Traits Questionnaire; TB = Thwarted Belonging; PB = Perceived Burdensomeness; ASA-A = Anxiety Scale for Autistic Adults; PHQ-9 = Patient Health Questionnaire—9 Items; ASC = Autism Spectrum Condition; PDD-NOS = Pervasive Developmental Disorder—not otherwise specified; ADHD = Attention Deficit and Hyperactivity Disorder; OCD = Obsessive Compulsive Disorder; PTSD = Post Traumatic Stress Disorder