From: Causes of different goiter rates with the same iodine deficiency among the pastoral and agricultural populations of Tibet: a geographical comparison
N =100
Selenium intake (μg)
Iron intake (mg)
Median
Interquartile
Range
Pastoral residents
30.0
10.3
7.0~77.4
15.8
5.8
7.2~37.1
Agricultural residents
23.8
6.9~58.8
13.2
6.4
4.5~32.2
p
0.000
0.001