Syndromic surveillance and heat wave morbidity: a pilot study based on emergency departments in France

Table 4 Heat wave disease syndromes (visits/proportion) by age group and period, 49 ED, France summer 2006

	Less than 75 years old				At least 75 years old
	ONAP¹		OFAP²		ONAP¹		OFAP²
	HWDS³ ED Visits	HWDS³ ED Visits as a proportion of total ED Visits	HWDS³ ED Visits	HWDS³ ED Visits as a proportion of total ED Visits	HWDS³ ED Visits	HWDS³ ED Visits as a proportion of total ED Visits	HWDS³ ED Visits	HWDS³ ED Visits as a proportion of total ED Visits
Malaise	1,808	2.46%***	5,554	1.85%	661	7.70%***	2,062	6.24%
Hyperthermia	98	0.13%*	115	0.04%	31	0.35%***	10	0.03%
Hyponatremia	59	0.08% (NS)	99	0.03%	139	1.62%***	187	0.57%
Dehydration	67	0.09% (NS)	112	0.04%	161	1.88%***	207	0.63%
Renal Colic	684	0.94%*	2,527	0.84%	19	0.22% (NS)	58	0.17%
Renal failure	59	0.08% (NS)	205	0.07%	57	0.66%*	170	0.51%
Total HWDS ³	2,775	3.78%***	8,612	2.87%	1,068	12.43%***	2,694	8.15%

* p < 0.05 ** p < 0.01 *** p < 0.001.
1: ONAP, 'On Alert' Period; 2: OFAP, 'Off Alert' Period; 3: HWDS, Heat Wave Disease Syndromes

ISSN: 1472-6947