TABLE 2

Reasons for Missing Hair Specimens or Specimens Excluded From This Report

Teens (N = 432)Parents (N = 431)
Cocaine Results Missing/Excluded, n (%)Opiate Results Missing/Excluded, n (%)Cocaine Results Missing/Excluded, n (%)Opiate Results Missing/Excluded, n (%)
Quantity not sufficient8 (1.9)38 (8.8)9 (2.1)52 (12.1)
Refused hair specimen55 (12.7)55 (12.7)99 (23.0)99 (23.0)
Hair too short for sampling87 (20.1)87 (20.1)14 (3.2)14 (3.2)
Hairstyle (braids, weave, etc)14 (3.2)14 (3.2)10 (2.3)10 (2.3)
Teen did not complete testing10 (2.3)10 (2.3)11 (2.6)11 (2.6)
Laboratory error3 (0.7)3 (0.7)
No caregiver (teen in group home)1 (0.2)1 (0.2)
Total missing a hair specimen174 (40.3)204 (47.2)147 (34.1)190 (44.1)
Specimen and report >3 mo apart47 (10.9)47 (10.9)40 (9.3)28 (6.5)
Total missing/excluded hair specimens221 (51.2)251 (58.1)187 (43.4)218 (50.6)
Total hair specimens reported211 (48.8)181 (41.9)244 (56.6)213 (49.4)