Fig 1. Metals concentration (A—cadmium; B—zinc) and Zn/Cd ratio (C) in smoking and non-smoking women during pregnancy.

^{1, 2,3} significant (p < 0.04) for the Zn in the same group to the other trimester (e.g. ¹S group in the 1^st trimester has higher level of Zn than in the 3^rd trimester). *^-*** significant (p < 0.02) for the same parameter in the same trimester for different smoking group (e.g. *S group in the 1^st trimester has higher level of Cd than NS group in the same trimester).