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. Author manuscript; available in PMC: 2009 Mar 1.
Published in final edited form as: Acta Trop. 2007 Dec 8;105(3):235–241. doi: 10.1016/j.actatropica.2007.12.002

Table 2.

Univariate and multivariate linear regression coefficient estimates of environmental factors associated with the logarithm in base 10 of O. quadrasi snail density in 50 villages of Samar Province, the Philippines, 2003–2004.

Factor Reference Univariable models Multi-variable model
Regression coefficient 95%CI Regression coefficient 95%CI
Irrigation
Irrigated Rain-fed 0.02 −0.07 to 0.10 0.02 −0.07 to 0.11
Habitat
     Canal Stream, spring −0.03 −0.14 to 0.08 0.00 −0.11 to 0.11
     Other Stream, spring −0.04 −0.16 to 0.07 −0.01 −0.13 to 0.10
Substratum
     Plants or organic debris Stones, sand, clay 0.06 −0.02 to 0.14 0.02 −0.07 to 0.12
Proportion of ring samples located in an area where shade is provided by
     Tree cover 0.14 0.02 to 0.25 0.11 −0.01 to 0.24
     Grass −0.03 −0.15 to 0.10 −0.01 −0.15 to 0.13
     Palm trees −0.18 −0.66 to 0.29 −0.12 −0.62 to 0.37
     Other vegetation −0.07 −0.18 to 0.04 −0.07 −0.19 to 0.05