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Table 3 Data from trials on quetiapine or aripiprazole in patients below 19 years with psychosis used for final power calculation

From: Quetiapine versus aripiprazole in children and adolescents with psychosis - protocol for the randomised, blinded clinical Tolerability and Efficacy of Antipsychotics (TEA) trial

Study (reference)

Design and population

Intervention

ITT population N

PANSS-P scores baseline (SD)

PANSS-P scores follow-up (SD)

Change PANSS-P scores from baseline to follow-up (SD)

Schimmelman et al. 2007 [71]

Open Label

Quetiapine

N=52

Quetiapine:

Quetiapine:

Quetiapine:

Non-RCT

12 weeks

200-800 mg

 

21.4 (5.2)

14.5 (7.4)

-6.9 (na)

Schiz. spectrum

Most drug-naïve

12-17 years

Findling et al. 2008 [11]

Double-blind RCT 6 weeks

Aripiprazole 10 mg/30 mg vs placebo

N=302 (100 vs 100 vs 102)

Aripiprazole 10 mg: 22.1 (SD=5.0)

Aripiprazole 10 mg: 14.5 (SE=0.6 i.e. SD=6.0*)

Aripiprazole 10 mg: -7.6 (SE=0.6 i.e. SD=6.0*)

Schiz. 13-17 years

Aripiprazole 20 mg: 23.5 (SD=5.0)

Aripiprazole 20 mg: 15.4 (SE=0.6 i.e. SD=5.9*)

Aripiprazole 20 mg: -8.1 (SE=0.6 i.e. SD=5.9*)

Arango et al. 2009 [20]

Open label RCT

Quetiapine vs Olanzapine

N=50

Quetiapine:

Quetiapine:

Quetiapine:

6 months

(24 vs 26)

23.3 (7.3)

15.1 (4.1)

-8.2 (na)

Psychotic disorders

Most drug-naïve

flexible doses

12-18 years

Swadi et al. 2010 [21]

Open label RCT

Quetiapine up to 800 mg vs risperidone up to 6 mg

N=22

na

na

Quetiapine:

6 weeks

(11 vs 11)

-9.6 (5.5)

First episode

psychosis

Below 19 years

Findling et al. 2012 [15]

Double-blind RCT

Quetiapine 400 mg/800 mg vs placebo

N=220 (73 vs 74 vs 73)

Quetiapine 400 mg: 23.3 (5.8) Quetiapine 800 mg: 23.8 (4.8)

na

Quetiapine 400 mg:

6 weeks Schiz.

-8.6 (SE 0.7, i.e. SD=6.3*)

13-17 years

Quetiapine 800 mg:

-9.3 (SE 0.6, i.e. SD=5.1*)

NCT01009047 2013 [28]

Double-blind RCT

Paliperidone ER 3-9 mg vs Aripiprazole 5-15 mg

N=226 (112 vs 114)

Aripiprazole: 22.5 (4.3)

na

Aripiprazole week 8:

8 weeks/26 weeks

-6.2 (4.9)

Schiz.

Aripiprazole week 26:

12-17 years

-8.3 (6.1)

  1. Data on PANSS positive scores and standard deviations from these studies were considered in the sample size estimation of the TEA study. Weighted average of all SDs=5.48 and of change in SD=5.68. ITT=Intention-to-treat. PANNS-P=Positive and Negative Syndrome Scale – positive score. SD=standard deviation. SE=standard error. na=not available. ER=extended release formulation. vs=versus. Schiz.=Schizophrenia. *SD=SE√n.