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Table 1 Prevalence (%) of helminth parasites in the study population in the first (2005–2008), second (2009–2011), third (2012–2014) periods and overall

From: Helminth infections among long-term-residents and settled immigrants in Qatar in the decade from 2005 to 2014: temporal trends and varying prevalence among subjects from different regional origins

   Prevalence (95 % CL)   
  Period 1
2005–2008
(n = 9,208)
Period 2
2009–2011
(n = 8,844)
Period 3
2012–2014
(n = 11,234)
Combinedd
(n = 29,286)
Four common species
 Hook worms 2.05 (1.763–2.342) 1.38 (1.136–1.623) 0.42 (0.307–0.556) 1.22 (1.097–1.348)
Trichuris trichiura 0.49 (0.356–0.654) 0.42 (0.295–0.577) 0.13 (0.075–0.220) 0.33 (0.269–0.404)
Ascaris lumbricoides 0.34 (0.229–0.478) 0.19 (0.112–0.308) 0.12 (0.068–0.209) 0.21 (0.162–0.271)
Hymenolepis nana a 0.10 (0.045–0.186) 0.19 (0.112–0.308) 0.15 (0.088–0.242) 0.15 (0.106–0.198)
 Above 4 helminth spp. combined 2.63 (2.301–2.955) 2.01 (1.720–2.305) 0.76 (0.604–0.936) 1.72 (1.575–1.873)
Other species
Strongyloides sp. Nd 0.16 (0.087–0.266) 0.04 (0.014–0.104) 0.09 (0.057–0.148)
Schistosoma sp. Nd 0.06 (0.018–0.132) 0.07 (0.031–0.140) 0.06 (0.034–0.111)
 Taenia sp. Nd 0.02 (0.003–0.082) 0.04 (0.010–0.091) 0.03 (0.011–0.065)
 Others combinedb Nd 0.03 (0.007–0.099) 0.04 (0.014–0.104) 0.04 (0.017–0.079)
 All helminths combinedc Nd 2.23 (1.920–2.535) 0.93 (0.757–1.113) 1.50 (1.336–1.672)
  1. aThis species is also known as Rodentolepis nana
  2. bThis row includes 8 cases of three rarely encountered species, Enterobius vermicularis, Fasciola hepatica and Trichostrongylus sp
  3. cThis row summarises data for periods 2 and 3, but does not include period 1 when some of the helminths were not recorded
  4. dOverall prevalence across periods 1, 2 and 3 combined or periods 2 and 3 combined when relevant data for period 1 were not available
  5. Nd = not done, these species were not assessed independently in the first period