Table 1.
Clinical characteristics, SIB documentation, and SIB
| N | Overall | SIB documentation Mean (SD)/% |
No SIB documentation Mean (SD)/% |
p | SIB (self-injurious behavior) Mean (SD)/% |
No SIB Mean (SD)/% |
p | |
|---|---|---|---|---|---|---|---|---|
| Age (years) | 1,432 | 15.4 (1.9) | 15.6 (1.9) | 15.2 (1.9) | <.001 | 16.1 (1.6) | 15.4 (2.0) | <.001 |
| Gender | .06 | .001 | ||||||
| Male | 135 | 9.4 | 7.7 | 10.7 | 3.2 | 10.8 | ||
| Female | 1,297 | 90.6 | 92.3 | 89.3 | 96.8 | 89.2 | ||
| Ethnicity (% Caucasian) | 1,048 | 75.3 | 74.7 | 75.8 | NS | 78.5 | 72.0 | .07 |
| %MBWa | 1,432 | 89.9 (19.3) | 91.4 (17.0) | 88.8 (20.8) | <.001 | 95.0 (18.0) | 89.0 (16.0) | <.001 |
| Anorexia nervosa (AN) | 358 | 75.8 (6.5) | ||||||
| Eating disorders not otherwise specified (EDNOS) |
905 | 92.4 (19.7) | ||||||
| Bulimia nervosa (BN) | 169 | 106.5 (16.3) | ||||||
| Months disease | 1,423 | 15.3 (14.6) | 17.2 (15.4) | 13.9 (13.8) | <.001 | 21.7 (17.5) | 14.1 (13.0) | <.001 |
| Purging | ||||||||
| Last month | 452 | 31.6 | 40.0 | 25.5 | <.001 | 54.8 | 29.8 | <.001 |
| Lifetime | 603 | 42.3 | 53.9 | 33.5 | <.001 | 75.4 | 39.2 | <.001 |
| Months purging | 573 | 13.6 (14.5) | 14.5 (15.3) | 12.5 (13.6) | NS | 16.6 (15.9) | 11.7 (14.0) | .001 |
| Binge eating | ||||||||
| Last month | 411 | 30.6 | 37.9 | 24.8 | <.001 | 50.2 | 29.4 | <.001 |
| Lifetime | 503 | 37.4 | 46.4 | 30.4 | <.001 | 60.5 | 36.6 | <.001 |
| Laxative abuse | 254 | 17.7 | 20.9 | 15.4 | .007 | 32.0 | 13.3 | <.001 |
| Diet pill use | 308 | 21.5 | 19.3 | 23.2 | .08 | 31.2 | 11.0 | <.001 |
| Cigarette use | 311 | 21.7 | 24.3 | 19.8 | .04 | 39.2 | 14.1 | <.001 |
| Alcohol use | 582 | 40.6 | 48.9 | 34.5 | <.001 | 67.2 | 36.2 | <.001 |
| Marijuana use | 322 | 22.5 | 28.8 | 17.8 | <.001 | 41.6 | 19.9 | <.001 |
| Other drug use | 147 | 10.3 | 12.4 | 8.7 | .02 | 19.2 | 7.7 | <.001 |
| Comorbid mood disorder | 400 | 27.9 | 33.7 | 23.7 | <.001 | 48.8 | 23.2 | <.001 |
| Antidepressant use | 345 | 24.1 | 26.8 | 22.1 | .04 | 37.2 | 19.6 | <.001 |
| History of abuse | 211 | 17.8 | 21.8 | 14.5 | .001 | 35.1 | 13.2 | <.001 |
| Diagnosis | <.001 | .001 | ||||||
| AN | 358 | 25.0 | 21.2 | 27.8 | 15.6 | 25.1 | ||
| EDNOS | 905 | 63.2 | 63.4 | 63.0 | 63.6 | 63.3 | ||
| BN | 169 | 11.8 | 15.4 | 9.1 | 20.8 | 11.6 | ||
| AN behaviors | ||||||||
| Restrict onlyb | 223 | 67.4 | 54.8 | 74.9 | <.001 | 32.4 | 64.4 | .005 |
| Binge only | 31 | 9.4 | 8.9 | 9.7 | 8.1 | 9.2 | ||
| Purge only | 30 | 9.1 | 11.3 | 7.7 | 16.2 | 9.2 | ||
| Binge/purge | 47 | 14.2 | 25.0 | 7.7 | 43.2 | 17.2 | ||
| Laxative abuse | 44 | 12.3 | 16.9 | 9.6 | .04 | 23.1 | 14.3 | NS |
| Diet pill use | 63 | 17.6 | 14.6 | 19.3 | NS | 25.6 | 9.9 | .02 |
| Cigarette use | 52 | 14.5 | 16.2 | 13.6 | NS | 28.2 | 11.0 | .02 |
| Alcohol use | 105 | 29.3 | 38.5 | 24.1 | .004 | 53.8 | 31.9 | .02 |
| Marijuana use | 59 | 16.5 | 22.3 | 13.2 | .03 | 38.5 | 15.4 | .004 |
| Other drug use | 32 | 8.9 | 13.1 | 6.6 | .04 | 17.9 | 11.0 | NS |
| Comorbid mood disorder | 94 | 26.3 | 29.2 | 24.6 | NS | 46.2 | 22.0 | .005 |
| Antidepressant use | 95 | 26.5 | 28.5 | 25.4 | NS | 38.5 | 24.2 | .1 |
| History of abuse | 38 | 12.9 | 14.0 | 12.2 | NS | 29.4 | 7.5 | .002 |
| EDNOS behaviors | ||||||||
| Restrict onlyb | 424 | 50.4 | 42.7 | 56.5 | <.001 | 23.5 | 55.9 | <.001 |
| Binge only | 80 | 9.5 | 7.7 | 10.9 | 4.6 | 9.9 | ||
| Purge only | 160 | 19.0 | 20.0 | 18.2 | 26.8 | 13.3 | ||
| Binge/purge | 178 | 21.1 | 29.6 | 14.3 | 45.1 | 18.9 | ||
| Laxative abuse | 147 | 16.2 | 17.8 | 15.1 | NS | 29.6 | 9.6 | <.001 |
| Diet pill use | 175 | 19.3 | 16.2 | 21.7 | .04 | 27.0 | 8.7 | <.001 |
| Cigarette use | 182 | 20.1 | 21.6 | 19.0 | NS | 37.1 | 10.9 | <.001 |
| Alcohol use | 357 | 39.4 | 46.4 | 34.2 | <.001 | 66.0 | 32.8 | <.001 |
| Marijuana use | 186 | 20.6 | 24.7 | 17.4 | .007 | 39.0 | 14.8 | <.001 |
| Other drug use | 81 | 9.0 | 10.1 | 8.1 | NS | 17.0 | 5.2 | <.001 |
| Comorbid mood disorder | 245 | 27.1 | 33.8 | 22.1 | <.001 | 47.2 | 24.5 | <.001 |
| Antidepressant use | 196 | 21.7 | 24.5 | 19.5 | .07 | 34.6 | 17.5 | <.001 |
| History of abuse | 130 | 17.3 | 20.6 | 14.5 | .03 | 33.8 | 12.0 | <.001 |
| BN behaviorsc | ||||||||
| Laxative abuse | 63 | 37.3 | 39.4 | 34.7 | NS | 46.2 | 31.0 | NS |
| Diet pill use | 70 | 41.4 | 38.3 | 45.3 | NS | 48.1 | 26.2 | .03 |
| Cigarette use | 77 | 45.6 | 46.8 | 44.0 | NS | 53.8 | 38.1 | NS |
| Alcohol use | 120 | 71.0 | 73.4 | 68.0 | NS | 80.8 | 64.3 | .07 |
| Marijuana use | 77 | 45.6 | 54.3 | 34.7 | .01 | 51.9 | 57.1 | NS |
| Other drug use | 34 | 20.1 | 21.3 | 18.7 | NS | 26.9 | 14.3 | NS |
| Comorbid mood disorder | 61 | 36.1 | 39.4 | 32.0 | NS | 55.8 | 19.0 | <.001 |
| Antidepressant use | 54 | 32.0 | 34.0 | 29.3 | NS | 44.2 | 21.4 | .02 |
| History of abuse | 43 | 30.7 | 38.5 | 21.0 | .03 | 43.9 | 32.4 | NS |
a
%MBW represents percentage median body weight, where a median weight is determined from the 2000 CDC BMI-for-age percentile growth charts for U.S. boys and girls.
b
Lifetime histories of restricting only, binge only, purge only, and binge/purge behaviors were analyzed in one 2×4 chi-squared test with regard to SIB documentation and SIB in those whose charts documented this information. As a result, only one p value is reported for these four categories in the corresponding columns.
c
Lifetime binge and/or purge behaviors were not analyzed separately within the BN category, as all subjects with BN reported both binge eating and purging behaviors.