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["Additional file 1. Descriptive characteristics of all eligible studies."]
["Study","Setting","Population","Population size","Length of study (mths)","Mean (range) turbidity (NTU)","GI incidence","Source of GI data"]
["Morris, 1996[15]","U.S.","Inhabitants of Wisconsin seeking treatment at Medical College of Wisconsin hospitals","Not stated.",14,"Effluent ~0.3 (0.1 to 0.5) (from graph)","2399 hospital visits, 3896 A&E visits/admissions","Medical College of Wisconsin billing  records"]
["Schwartz, 1997[17]","U.S.","All children visiting or admitted to Children’s Hospital of Philadelphia ","1.2 Million",60,"Effluent <0.2 (IQR 0.16 to 0.20) ","3282 A&E visits, 1755 admissions","Children’s Hospital of Philadelphia admission records"]
["Morris, 1998[23]","U.S.","Inhabitants of Wisconsin seeking treatment at Medical College of Wisconsin hospitals","Not stated",14,"Effluent ~0.3 (0.1 to 0.5) (from graph)","Infer from Morris et. al. 1996.","Medical College of Wisconsin billing  records"]
["Beaudeau, 1999[21]","France","Inhabitants of  lower city of Le Havre living near one pharmacy ","Not stated.",40,"Pre-treatment ~30 (1 to 100), effluent ~0.20 (0.1 to 1.2) (from graph)","Average daily drug sales 5.3 boxes","Sales records from surveillance network of pharmacists"]
["Schwartz, 2000[24]","U.S.","All residents of Philadelphia over 65 years of age ","1.2 Million",24,"Effluent <0.20 (IQR 0.16 to 0.21) ","6021 admissions","Reports to Health Care Financing Administration (all hospital treatment of Medicare patients)"]
["Aramini, 2000[20]","Canada","Population of Greater Vancouver","2 Million",84,"Pre-treatment < 1.3 (0.2 to 19) ","11,353 admissions, 16,609 physician visits, 3,634 children’s A&E visits","Canadian Institute of Health Information (CIHI) admission data, British Columbia Medical Service Plan physician billing data, individual hospital A&E data  "]
["Lim, 2002[25]","Canada","Population of Edmonton supplied by 1 of 2 treatment plants ",{"v":845000,"d":"845,000"},60,"Effluent 0.06 (0 to 0.38) ","1740 admissions, 10,287 A&E visits, 91,882 physician visits, 444 long-term care visits","CIHI admission data, Alberta Health Care Insurance Payment Plan physician-billing data "]
["Naumova, 2003[26]","U.S.","People aged 65 and older in Milwaukee county  ",{"v":130502,"d":"130,502"},14,"Effluent ~0.3 (0.1 to 0.5) (from graph)","445 A&E visits or hospitalizations","Health Care Financing Administration admission data, A&E visit records."]
["Gilbert, 2006[22]","Canada","Inhabitants served by Quebec City water treatment plant and the Info-Santé telephone health system of Basse-Ville-Limoilou-Vanier CLSC.","81,417 people in 2000, 81,028 in 2001, 80,626 in 2002",28,"Effluent 0.267 (0.110 to 0.750) ","19.123 calls per 1,000 person-years.","Records of calls to Info-Santé CLSC "]

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