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Table 3 Associations between intestinal worm infection and underweight confounded by anemia and low IQ

From: Association between intestinal worm infection and malnutrition among rural children aged 9–11 years old in Guizhou Province, China

  Model 1 Model 2 Model 3 Model 4
Anaemia (first) Underweight Anaemia (altitude adjusted) Underweight Low process IQ Underweight Low memory IQ Underweight
Intestinal worm infection 0.19 (0.11) 0.18 (0.20) 0.24** (0.12) 0.18 (0.20) 0.61*** (0.09) 0.20 (0.20) 0.81*** (0.15) 0.20 (0.20)
Low memory IQ         −0.17 (0.30)
Low process IQ       −0.13 0.21)   
Anaemia (altitude adjusted)     0.14 (0.25)     
Anaemia (first)   0.17 (0.24)       
Ethnic minority −0.11 (0.18) 0.60 (0.42) −0.11 (0.19) 0.60 (0.42) −0.11 (0.15) 0.59 (0.42) −0.05 (0.23) 0.59 (0.42)
Gender −0.08 (0.11) 0.10 (0.20) −0.06 (0.12) 0.10 (0.20) 0.16* (0.09) 0.10 (0.20) 0.08 (0.13) 0.10 (0.20)
Grade −0.16*** (0.06) −1.47*** (0.13) −0.18*** (0.06) −1.46*** (0.13) − 0.25*** (0.05) − 1.47*** (0.13) −0.11* (0.07) −1.46*** (0.13)
Boarding 0.08 (0.13) −0.19 (0.23) 0.05 (0.13) −0.19 (0.23) 0.05 (0.10) −0.19 (0.23) 0.50*** (0.17) −0.18 (0.23)
Migrant mother 0.07 (0.14) −0.16 (0.25) 0.11 (0.14) −0.16 (0.25) −0.19* (0.11) − 0.16 (0.25) −0.01 (0.16) − 0.16 (0.25)
Migrant father −0.03 (0.14) − 0.10 (0.24) −0.06 (0.14) − 0.10 (0.24) 0.22* (0.11) − 0.10 (0.24) −0.05 (0.16) − 0.10 (0.24)
Household size −0.12** (0.06) 0.17* (0.09) −0.15** (0.06) 0.17* (0.09) −0.06 (0.04) 0.17* (0.09) −0.11* (0.06) 0.17* (0.09)
Number of siblings −0.08 (0.08) −0.10 (0.13) − 0.03 (0.09) −0.10 (0.13) − 0.03 (0.06) −0.10 (0.13) 0.01 (0.09) −0.10 (0.13)
Constant −0.19 (0.37) 0.40 (0.67) −0.15 (0.38) 0.42 (0.67) 1.49*** (0.30) 0.56 (0.69) 2.61*** (0.43) 0.61 (0.72)
Pseudo R2 0.0135 0.1908 0.0156 0.1906 0.0326 0.1906 0.0355 0.1906
Observations 2175 2175 2175 2175 2175 2175 2175 2175
  1. Note: ***, ** and * indicated 0.01, 0.05, and 0.10 significance level, respectively