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Table 1 Operational definitions of study variables

From: The burden of dengue, source reduction measures, and serotype patterns in Myanmar, 2011 to 2015–R2

SN Variables Operational definitions
1 Ecological regions:  
1.1 Delta and lowland (heavy rainfall more than 2500 mm) Ayeyarwady, Yangon, and Bago regions; Mon and Kayin states
1.2 Hills (moderate to heavy rainfall) Kachin, Kayah, Chin, and Shan states
1.3 Coastal (heavy rainfall more than 2500 mm) Rakhine state and Taninthayi regions
1.4 Plains (uneven topography and rainfall less than 1000 mm) Magway, Mandalay, Sagaing, and Nay Pyi Taw regions
2 Disease severity grade: (WHO grading of severity of DHF)  
2.1 DF Fever with two of the following: headache, retro-orbital pain, myalgia, bone pain, rash, and hemorrhagic manifestations (No evidence of plasma leakage)
2.2 DHF grade I Fever and hemorrhagic manifestation (positive tourniquet test) and evidence of plasma leakage
2.3 DHF grade II As in grade I plus spontaneous bleeding
2.4 DHF grade III As in grade I or II plus circulatory failure (weak pulse, narrow pulse pressure (≤ 20 mmHg), hypotension, restlessness)
2.5 DHF grade IV As in grade III plus profound shock with undetectable blood pressure and pulse
  1. WHO World Health Organization, DF dengue fever, DHF dengue hemorrhagic fever