Fig. 1
From: Iodine adequacy in reproductive age and pregnant women living in the Western region of Saudi Arabia
The median of (a) spot urine iodine concentrations, (b) spot urine creatinine concentrations, (c) urine spot iodine/creatinine ratio, (d) estimated 24-h urine creatinine excretion and (e) estimated 24-h urine iodine excretion in each trimester of pregnancy. (a = P <  0.05 compared with the 1st trimester and b = P <  0.05 compared with 2nd trimester by one-way ANOVA and green rectangle = the recommended WHO intervals for iodine adequacy in pregnant women)