. Author manuscript; available in PMC: 2018 Dec 1.

Published in final edited form as: J Child Psychol Psychiatry. 2018 Apr 26;59(12):1298–1308. doi: 10.1111/jcpp.12921

Table 2.

Secondary outcomes and group differences for QbOpen (QbTest report disclosed) versus QbBlind (QbTest report withheld). Figures are number (percentage) of participants unless stated otherwise.

	QbBlind arm (n = 127)	QbOpen arm (n = 123)	Comparison
Diagnostic decision made (%)	76 (60)	94 (76)	OR = 2.43; 95% CI [1.34 to 4.39]; p =.003 RD = 0.15; 95% CI [0.05 to 0.25]; p =.005
Diagnostic status (%)^#
ADHD confirmed	65 (51)	69 (56)
ADHD excluded	11 (9)	25 (20)	RRR = 2.14; 95% CI [1.00 to 4.59]; p =.049
No decision made	51 (40)	29 (24)
Diagnostic confidence (ADHD/not ADHD)^*	n =121	n =122
Possible / Uncertain	29 (24)	16 (13)	OR = 1.77; 95% CI [1.09 to 2.89]; p =.022
Probable	34 (28)	32 (26)
Definitely	58 (48)	74 (61)
Time to diagnosis in minutes (observed median survival time[95%CI])	165 (150 to180)	150 (140 to 155)	Time Ratio = 0.85;95% CI [0.77 to 0.93]; p =.001
Days to diagnosis (observed median survival time[95%CI])	108 (91 to 140)	96 (85 to 99)	Time ratio = 0.90; 95% CI [0.73 to 1.10]; p =.285
Stability (kappa, [95%CI])	0.90 (0.7 to 1)	1(1 to 1)	(χ²(1)=0.01, p=0.32)
Diagnostic accuracy^*
Sensitivity [95%CI]	96.1 (86.5 to 99.5)	86.0 (72.1 to 94.7)	ROC comparison χ2(df)=0.22(1), p =.636
Specificity [95%CI]	36.0 (1.0 to 57.5)	39.5 (24.9 to 55.6)

Data not available for all randomised participants. DAWBA n = 241. 123 DAWBAs were rated on partial information (missing parent/teacher data). 9 participants did not return DAWBA data.

Exploratory analysis (not pre-specified). RD = risk difference.