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Table 1 Sample char acteristics

From: The association of self-injurious behaviour and suicide attempts with recurrent idiopathic pain in adolescents: evidence from a population-based study

  Total No pain Recurrent pain P value
n (%) 5,504 (100) 4,575 (83.12) 929 (16.88)  
Type of school, n (%)    <0.001
 Hauptschule [reference] 1,573 (28.58) 1,269 (27.74) 304 (32.72)  
 Realschule 1,804 (32.78) 1,459 (31.89) 345 (37.14)
 Gymnasium 1,978 (35.94) 1,727 (37.75) 251 (27.02)
 Foerderschule 149 (2.71) 120 (2.62) 29 (3.12)
Gender, n (%)    <0.001
 Male [reference] 2,680 (48.69) 2,427 (53.05) 253 (27.23)  
 Female 2,609 (47.40) 1,970 (43.06) 639 (68.78)
 Item missing 215 (3.91) 178 (3.89) 37 (3.98)
Housing situation: living with, n (%)    <0.001
 Both parents [reference] 4,039 (73.38) 3,414 (74.62) 625 (67.28)  
 Mother 674 (12.25) 546 (11.93) 128 (13.78)
 Father 99 (1.80) 81 (1.77) 18 (1.94)
 Mother and new partner 428 (7.78) 319 (6.97) 109 (11.73)
 Father and new partner 46 (0.84) 42 (0.92) 4 (0.43)
 Foster home 19 (0.35) 15 (0.33) 4 (0.43)
 With other person 49 (0.89) 36 (0.79) 13 (1.40)
 Item missing 150 (2.73) 122 (2.67) 28 (3.01)
Year of birth, n (%)    0.062
 1987 108 (1.96) 89 (1.95) 19 (2.05)  
 1988 724 (13.15) 584 (12.77) 140 (15.07)
 1989 [reference] 2,776 (50.44) 2,286 (49.97) 490 (52.74)
 1990 1,882 (34.19) 1,604 (35.06) 278 (29.92)
 1991 13 (0.24) 11 (0.24) 2 (0.22)
 1992 1 (0.02) 1 (0.02) 0 (0.00)
Self injury, n (%)    <0.001
 Never [reference] 4,688 (85.17) 4,055 (88.63) 633 (68.14)  
 1–3/year 598 (10.86) 408 (8.92) 190 (20.45)
 >3/year 218 (3.96) 112 (2.45) 106 (11.41)
Suicide attempts, n (%)    <0.001
 Never [reference] 5,074 (92.19) 4,323 (94.49) 751 (80.84)  
 One 315 (5.72) 193 (4.22) 122 (13.13)
 Multiple 115 (2.09) 59 (1.29) 56 (6.03)
General pain, n (%)    <0.001
 Never [reference] 4,207 (76.44) 3,810 (83.28) 397 (42.73)  
 Somewhat or sometimes true 949 (17.24) 765 (16.72) 184 (19.81)
 Very true or often true 258 (4.69) 0 (0.00) 258 (27.77)
 Item missing 90 (1.64) 0 (0.00) 90 (9.69)
Headache, n (%)    <0.001
 Never [reference] 2,852 (51.82) 2,727 (59.61) 125 (13.46)  
 Somewhat or sometimes true 1,980 (35.97) 1,810 (39.56) 170 (18.30)
 Very true or often true 609 (11.06) 0 (0.00) 609 (65.55)
 Item missing 63 (1.14) 38 (0.83) 25 (2.69)
Abdominal pain, n (%)    <0.001
 Never [reference] 3,598 (65.37) 3,296 (72.04) 302 (32.51)  
 Somewhat or sometimes true 1,534 (27.87) 1,254 (27.41) 280 (30.14)
 Very true or often true 337 (6.12) 0 (0.00) 337 (36.28)
 Item missing 35 (0.64) 25 (0.55) 10 (1.08)
YSR scales, mean (SD)
 1. Withdrawn/depressed 3.00 (2.38) 2.79 (2.24) 4.07 (2.72) <0.001
 2. Somatic complaints 2.93 (2.69) 2.21 (1.99) 6.47 (2.87) <0.001
 3. Anxious/depressed 5.59 (4.54) 5.43 (3.69) 8.79 (4.96) <0.001
 4. Social problems 2.06 (1.95) 1.98 (1.87) 2.49 (2.22) <0.001
 5. Thought problems 1.45 (1.93) 1.27 (1.73) 2.32 (2.55) <0.001
 6. Attention problems 4.58 (2.73) 4.28 (2.61) 5.98 (2.85) <0.001
 7. Delinquent behavior 4.51 (3.16) 4.25 (2.98) 5.81 (3.65) <0.001
 8. Aggressive behavior 8.8 (5.23) 8.28 (4.96) 11.2 (5.78) <0.001