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Table 3 Summary of gestational age at each time of ultrasound measurement

From: Maternal exposure to ambient fine particulate matter and fetal growth in Shanghai, China

Ultrasound measurements Summary of gestational age
Mean Std. Dev Freq Rang
1st 19.96 5.15 7965 13.5~40.0
2nd 25.48 4.28 7269 13.6~40.6
3rd 30.93 4.25 6280 14.1~40.4
4th 34.91 3.55 4701 15.2~40.6
5th 36.97 3.04 2540 14.1~40.7
6th 37.69 2.91 850 14.0~40.9
7th 37.59 3.28 235 14.3~40.6
8th 37.35 3.32 55 24.0~40.6
9th 37.25 3.37 21 28.6~40.6
10th 37.44 2.17 10 32.4~40.4
Total 28.09 7.54 29,926 13.5~40.9