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Table 4 Associations between intestinal worm infection and stunting 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) Stunting Anaemia (altitude adjusted) Stunting Low process IQ Stunting Low memory IQ Stunting
Intestinal worm infection 0.19 (0.11) 0.49*** (0.10) 0.24** (0.12) 0.49*** (0.10) 0.61*** (0.09) 0.42*** (0.10) 0.81*** (0.15) 0.44*** (0.10)
Low memory IQ         0.75*** (0.18)
Low process IQ       0.59*** (0.11)   
Anaemia (altitude adjusted)     0.16 (0.13)     
Anaemia (first)   0.10 (0.12)       
Ethnic minority −0.11 (0.18) 0.24 (0.17) −0.11 (0.19) 0.24 (0.17) −0.11 (0.15) 0.24 (0.17) −0.05 (0.23) 0.24 (0.17)
Gender −0.08 (0.11) −0.16 (0.10) − 0.06 (0.12) −0.16 (0.10) 0.16* (0.09) −0.18* (0.10) 0.08 (0.13) −0.17* (0.10)
Grade −0.16*** (0.06) −0.19*** (0.05) − 0.18*** (0.06) −0.19*** (0.05) − 0.25*** (0.05) −0.16*** (0.05) − 0.11* (0.07) −0.19*** (0.05)
Boarding 0.08 (0.13) 0.32*** (0.11) 0.05 (0.13) 0.32*** (0.11) 0.05 (0.10) 0.32*** (0.11) 0.50*** (0.17) 0.29*** (0.11)
Migrant mother 0.07 (0.14) 0.01 (0.12) 0.11 (0.14) 0.01 (0.12) −0.19* (0.11) 0.03 (0.12) −0.01 (0.16) 0.01 (0.12)
Migrant father −0.03 (0.14) 0.03 (0.12) −0.06 (0.14) 0.03 (0.12) 0.22* (0.11) 0.00 (0.12) −0.05 (0.16) 0.03 (0.12)
Household size −0.12** (0.06) −0.05 (0.05) − 0.15** (0.06) −0.05 (0.05) − 0.06 (0.04) −0.04 (0.05) − 0.11* (0.06) −0.04 (0.05)
Number of siblings −0.08 (0.08) 0.14** (0.07) −0.03 (0.09) 0.14** (0.07) −0.03 (0.06) 0.15** (0.07 0.01 (0.09) 0.14** (0.07)
Constant −0.19 (0.37) −0.65** (0.33) − 0.15 (0.38) −0.67** (0.33) 1.49*** (0.30) −1.11 *** (0.34) 2.61*** (0.43) −1.31*** (0.37)
Pseudo R2 0.0135 0.0254 0.0156 0.0258 0.0326 0.0372 0.0355 0.0328
Observations 2175 2175 2175 2175 2175 2175 2175 2175
  1. Note: ***, ** and * indicates 0.01, 0.05, and 0.10 significance level, respectively