Table 1

Number of children reporting psychosis-like symptoms: comparisons between self-report and observer-rated assessments (N=6435–6455)

Self-report stem questionsa Observer rateda Frequency,b suspected or definitely presenta Positive predictive valuesa,c
Item Yes Maybe Total Suspected Definite Total
a. Presented as prevalence in the past 6 months, 95% confidence interval.
b. Weekly and more often.
c. Self-report ‘yes’ or ‘maybe’ and observer rating symptom as ‘suspected’ or ‘definitely present’.
d. Results for the subgroup of children for whom full (‘complete’) data on psychosis-like symptoms, social class, gender, ethnicity and maternal education were available.
e. Weighted for social class, gender, ethnicity and maternal education.
Hallucinations, n (%)
     Auditory 489 (7.6) 155 (2.4) 644 (10.0) 227 (3.5) 243 (3.8) 470 (7.3) 84 (18.8) 70.6 (67.1-74.2)
     Visual 393 (6.1) 111 (1.7) 504 (7.8) 152 (2.4) 105 (1.6) 257 (4.0) 31 (12.9) 50 (45.6-54.4)
Delusions, n (%)
     Being spied on 1054 (16.3) 150 (2.3) 1204 (18.7) 142 (2.2) 52 (0.8) 194 (3.0) 51 (28.3) 16.1 (14.1-18.2)
     Persecution 509 (7.9) 114 (1.8) 623 (9.7) 16 (0.2) 1 (0.0) 17 (0.3) 7 (46.7) 2.7 (1.5-4.0)
     Thoughts being read 424 (6.6) 176 (2.7) 600 (9.3) 37 (0.6) 3 (0.0) 40 (0.6) 11 (28.2) 6.0 (4.1-7.9)
     Reference 115 (1.8) 71 (1.1) 186 (2.9) 32 (0.5) 16 (0.2) 48 (0.7) 8 (19.5) 25.2 (19.0-31.5)
     Control 102 (1.6) 38 (0.6) 140 (2.2) 33 (0.5) 11 (0.2) 44 (0.7) 12 (28.6) 31.4 (23.7-39.1)
     Grandiose ability 167 (2.6) 81 (1.3) 248 (3.8) 57 (0.9) 15 (0.2) 72 (1.1) 22 (35.5) 28.2 (22.6-33.8)
     Other unspecified 14 (0.2) 7 (0.1) 21 (0.3) 8 (47.1)
Thought, n (%)
     Broadcasting 213 (3.3) 90 (1.4) 303 (4.7) 65 (1.0) 20 (0.3) 85 (1.3) 21 (26.9) 28.1 (23.1-33.2)
     Insertion 246 (3.8) 89 (1.4) 335 (5.2) 71 (1.1) 18 (0.3) 89 (1.4) 15 (18.8) 26.6 (21.9-31.4)
     Withdrawal 80 (1.2) 37 (0.6) 117 (1.8) 15 (0.2) 8 (0.1) 23 (0.4) 4 (19.0) 19.8 (12.6-27.1)
Overall, n (%) (95% CI) 2083 (32.3) (31.2-33.5) 839 (13.0) (12.0-13.7) 2509 (38.9) (37.7-40.1) 646 (10.0) (9.3-10.8) 364 (5.6) (5.1-6.2) 881 (13.7) (12.8-14.5) 34.6 (32.7-36.4)
Overall, complete,d unadjusted % (95% CI) 32.1 (30.9-33.3) 12.8 (12.0-13.7) 38.7 (37.5-40.0) 9.9 (9.2-10.7) 5.50 (5.0-6.1) 13.5 (12.6-14.3)
Overall, weighted,e % (95% CI) 32.5 (32.1-33.7) 12.8 (11.9-13.7) 39.0 (37.7-40.3) 10.1 (9.3-10.8) 5.8 (5.1-6.4) 13.8 (12.8-14.7)