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Table 3 Space-time clusters with higher rate of ADE in three time periods (2004–2013, 2004–2008 and 2099–2013) (p < 0.001)

From: A decade of adverse drug events in Portuguese hospitals: space-time clustering and spatial variation in temporal trends

Time period Clusters No. Of municipalities Time frame Observed/expected ratio
2004–2013 A 48 2010–2013 1.36
B 5 2009–2013 1.75
2004–2008 A 8 2007–2008 1.43
B 6 2006–2007 1.75
2009–2013 A 39 2012–2013 1.33
B 5 2012–2013 1.61
C 5 2012–2013 1.62
D 4 2012–2013 1.60
E 8 2012–2013 1.58