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Table 5 Tvol (mL) of 8 to 10 years old children with different household SIC (median; P25, P75)

From: Iodine status of 8 to 10 years old children within 20 years following compulsory salt iodization policy in Shanghai, China

Year

Non-iodized salt group

Low-iodine salt group

High-iodine salt group

χ2

P

N (%)

Tvol

N (%)

Tvol

N (%)

Tvol

1999

69 (5.5)

1.2 (0.9,1.5)

215 (17.2)

1.1 (0.9,1.4)

968 (77.3)

1.2 (1.0,1.6)

9.2

0.010

2005

17 (1.4)

2.4 (2.1,2.7)

247 (20.2)

2.4 (2.2,2.8)

959 (38.8)

2.4 (2.2,2.7)

0.7

0.700

2011

95 (7.7)

1.0 (0.8,1.2)

660 (53.5)

1.0 (0.8,1.1)

479 (16.9)

1.0 (0.8,1.2)

0.3

0.865

2014

217 (14.4)

1.9 (1.3,2.4)

1038 (68.7)

1.8 (1,2.5)

255 (16.9)

1.8 (1.1,2.5)

0.8

0.659

2017

283 (23.4)

2.6 (1.8,3.5)

846 (70.0)

2.8 (2,3.7)

80 (6.6)

3.1 (1.6,4.0)

2.1

0.348