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Table 1 The basic characteristics of included papers

From: Systematic review of the relationship of Helicobacter pylori infection with geographical latitude, average annual temperature and average daily sunshine

Region Author Number (n) Positive rate Latitude (°) Temperature (°C) Sunshine (h) HDI
Europe
 Israel Niv 2128 0.328 31.00 9.31 16.45 0.872
 Nottingham Jackson 2437 0.264 52.56 3.77 9.80 0.768
 Lebanon Naja 308 0.520 33.45 8.05 20.87 0.761
 Berlin Berg 1806 0.392 52.30 4.45 8.88 0.801
 Rome Gasbarrini 655 0.400 41.80 6.77 15.20 0.825
 Leeds Moayyedi 8429 0.276 53.48 3.36 8.76 0.818
 Magdeburg Wex 2318 0.444 52.80 4.45 8.75 0.906
 Novosibirsk Reshetnikov 438 0.884 55.20 6.03 1.73 0.723
 Prague Bures 1406 0.292 50.05 4.57 7.85 0.867
 Loiano Bazzoli 1533 0.679 44.16 5.59 8.60 0.803
 Stockholm Sorberg 3502 0.177 59.19 4.99 6.63 0.855
 Wroclaw Iwanczak 3307 0.842 51.10 4.10 8.32 0.794
 Tbilisi Kretsinger 125 0.719 41.70 5.63 13.00 0.690
 Heidelberg Michel 1797 0.481 49.25 4.49 11.50 0.916
 Bratislava Kuzela 1838 0.351 48.08 5.58 10.50 0.836
 Tirana Monno 1088 0.707 41.19 6.97 15.20 0.682
 Reykjavik Thjodleifsson 447 0.363 64.08 3.48 4.30 0.859
 Uppsala Thjodleifsson 359 0.112 59.51 4.86 6.50 0.897
 Tartu Thjodleifsson 240 0.692 58.23 4.59 4.84 0.780
Asia
 Beijing Zhang 2006 0.833 40.15 7.52 11.80 0.645
 Ankara Akin 1089 0.774 39.52 6.71 11.71 0.653
 Korea Yim 13,697 0.586 36.00 5.77 11.82 0.853
 Okinawa Toyoda 1540 0.599 26.50 5.15 22.42 0.871
 Malaysia Goh 2381 0.359 4.00 6.11 26.73 0.727
 Islamabad Rasheed 205 0.819 33.43 8.07 21.34 0.522
 Yangzhong Zhu 5417 0.634 32.19 5.85 15.10 0.699
 North Sulawesi Miftahussurur 251 0.143 1.29 6.00 27.72 0.684
 Arak Afsharipour 525 0.742 34.10 8.09 13.65 0.751
 Nahavand Alizadeh 1518 0.710 34.11 7.55 10.83 0.735
 Penang Sasidharan 5370 0.142 5.24 6.75 27.00 0.723
 Tehran Nouraie 2326 0.690 35.40 8.25 17.00 0.703
 Seoul Kim 1485 0.649 37.33 5.77 11.82 0.853
 Kota Bharu Rahim 480 0.190 6.90 6.94 26.73 0.769
 Hsinchu Chen 3578 0.202 24.81 5.07 22.60 0.882
 Xiangshui Shi 1371 0.620 34.20 6.57 15.79 0.641
 Korea Lim 10,796 0.545 36.00 5.77 11.82 0.891
 Beijing Cheng 1232 0.468 40.15 7.52 11.80 0.812
 Hangzhou Xu 8820 0.438 30.30 5.42 15.79 0.723
 Hokkaido Ueda 1428 0.294 43.14 4.94 8.22 0.890
 Aomori Ueda 782 0.497 40.49 4.64 9.73 0.890
 Yamagata Ueda 3615 0.545 38.30 4.56 11.19 0.890
 Gunma Ueda 4914 0.323 36.40 5.42 13.91 0.890
 Aichi Ueda 2237 0.306 35.10 5.58 15.04 0.890
 Kagawa Ueda 442 0.378 34.30 5.80 15.35 0.890
America
 America Everhart 7465 0.325 36.09 7.07 15.06 0.859
 Nashville Epplein 310 0.787 36.09 6.88 15.06 0.888
 Seattle Ioannou 6724 0.535 47.38 5.95 11.13 0.859
 Ontario Naja 1306 0.294 43.40 5.58 7.16 0.896
 Aklavik Cheung 194 0.660 68.13 3.54 −8.20 0.896
 Nassau Carter 204 0.578 24.15 7.91 24.85 0.778
 São Paulo Zaterka 993 0.657 23.33 5.49 19.20 0.720
 Guadeloupe Weill 854 0.552 16.15 7.60 26.30 0.848
 São Paulo Oba–Shinjo 942 0.484 23.33 4.75 19.26 0.688
 Recife Melo 405 0.314 8.30 6.75 25.46 0.683
 Pelotas Santos 359 0.644 31.46 6.14 17.50 0.709
Africa
 Belgium Aguemon 446 0.740 6.21 6.44 27.22 0.413
 Tunis Mansour 250 0.632 36.48 7.69 20.00 0.689
Oceania
 Queensland Pandeya 1316 0.230 27.30 7.50 21.40 0.904
  1. HDI Human Development Index