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Table 1 Characteristics of selected studies for oipA gene on/off and presence/absence status analysis

From: Association of presence/absence and on/off patterns of Helicobacter pylori oipA gene with peptic ulcer disease and gastric cancer risks: a meta-analysis

Author Ethnicity Year Region gastritis or FD PUD GU DU GC
oipA+/total (%)d oipA+/tota (%)d oipA+/total (%)d oipA+/total cases (%)d oipA+/total cases (%)d
For oipA functional status (on/off) studies
Markovska, R. Bulgarian 2011 Europe 23/35(65.7%) 33/34(97.1%) / / /
Oleastro, M. Portuguese 2010 Europe 18/60(30.0%) 40/57(70.2%) / / /
Schmidt, H. M. Chinese 2010 Asia 45/52(86.5%) 14/16(87.5%) / 14/16(87.5%) 19/22(86.4%)
Chiarini, A. Italian 2009 Europe 17/21(81.0%) 7/10(70.0%) / / /
LI, N. Chinese 2009 Asia 66/86(76.7%) 12/12(100.0%) 12/12(100.0%) / 2/2(100.0%)
Oleastro, M. Portuguesea 2008 Europe 28/56(50.0%) 34/50(68.0%) / / /
Portugueseb 2008 Europe 17/53(32.1%) 26/31(83.9%) / / /
Yamaoka, Y. Colombian 2006 America 24/40(60.0%) 36/40(90.0%) / 36/40(90.0%) 36/40(90.0%)
American 2006 America 25/40(62.5%) 34/40(85.0%) / 34/40(85.0%) /
de Jonge, R. Dutch 2004 Europe 18/29(62.1%) 39/49(79.6%) 16/21(76.2%) 23/28(82.1%) 8/9(88.9%)
Zambon, C. F. Itilian 2003 Europe 15/31(48.4%) 14/19(73.7%) / / /
Yamaoka, Y. American 2002 America 25/40(62.5%) 37/41(90.2%) / 37/41(90.2%) 20/30(66.7%)
Colombian 2002 America 26/40(65.0%) 36/40(90.0%) / 36/40(90.0%) 34/41(82.9%)
Yamaoka, Y. Japanese 2000 Asia 40/40(100.0%) 40/40(100.0%) / 40/40(100.0%) /
For oipA gene (presence/absence) studies
Ji, C. W. Chinese 2011 Asia 26/46(56.5%) 45/58(77.6%) 45/58(77.6%) / 33/43(76.7%)
Ben, M. K. Tunisian 2010 Africa 186/195(95.4%) 63/78(80.8%) / / /
Xie, J. Chinese 2010 Asia 16/51(31.4%) 12/39(30.8%) 6/19(31.6%) 6/20(30.0%) 19/27(70.4%)
Dabiri, H. Persians 2009 Asia 36/57(63.2%) 2/13(15.4%) / / 0/4(0.0%)
Turkish 2009 Asia 7/21(33.3%) 3/5(60.0%) / / 1/7(14.3%)
Kurds, etc.c 2009 Asia 8/13(61.5%) 4/4(100.0%) / / /
Zhou, M. Chinese 2009 Asia 21/40(52.5%) 37/40(92.5%) / 37/40(92.5%) 18/20(90.0%)
Salih, B. A. Turkish 2007 Asia 17/21(81.0%) 13/14(92.9%) / / /
Zhang, J. Chinese 2004 Asia 11/42(26.2%) 16/16(100.0%) 16/16(100.0%) / /
  1. a, for adult study population; b, for children study population; c, Kurds, Lurs, Afghanis, Arabs; d, for oipA gene presence/absence studies, oipA(+) means oipA gene positive, while for oipA functional status on/off studies, oipA(+) means oipA gene “on” status.
  2. Abbreviations: FD functional dyspepsia, PUD peptic ulcer disease, GU gastric ulcer, DU duodenal ulcer, GC gastric cancer.