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. 2009 Feb 17;338:b95. doi: 10.1136/bmj.b95

Table 3.

 Mean change in numbers of students observed to use alternative sites from pre-test to post-test by group

Change from pre-test to post-test Control schools (n=26) Intervention schools (n=24)* Group difference
Mean change (95% CI) 0.87 (−0.22 to 1.95) −0.03 (−1.09 to 1.02) 0.90

*Excludes one intervention school where observations of the alternative site were not possible.