Table 3.

Improvement in PANSS outcomes

	Treatment as usual (n=245)	Cognitive behavioural therapy plus treatment as usual (n=242)	Number needed to treat (95% CI*)
More than 20%
9 months	98/216 (45%)	96/209 (46%)	178 (−11 to 10)
21 months	74/224 (33%)	82/218 (38%)	22 (−23 to 8)
More than 25%
9 months	57/224 (25%)	68/218 (31%)	18 (37 to 8)
21 months	82/216 (38%)	80/209 (38%)	318 (11 to 11)
More than 50%
9 months	11/224 (5%)	16/218 (7%)	42 (48 to 15)
21 months	14/216 (7%)	28/209 (13%)	15 (8 to 81†)
More than 75%
9 months	2/224 (1%)	2/218 (1%)	4070 (57 to 56)
21 months	2/216 (1%)	4/209 (2%)	102 (78 to 31)

Data are n/N (%), unless otherwise stated. The Positive and Negative Syndrome Scale (PANSS) is rescaled.

^*Number needed to treat (harm) to number needed to treat (benefit).

^†Number needed to treat (benefit) to number needed to treat (benefit).