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Hospitalization rates for different age groups across the intervention areas* during outcome-monitoring period**. *The P-value of interaction between areas, time and age was 0.12. **Term 1: 24 September 2011 to 23 March 2012; term 2: 24 March 2012 to 23 September 2012; term 3: 24 September 2012 to 23 March 2013; term 4: 24 March 2013 to 31 August 2013.
