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Fourth rib: volume in real people

The volume of this structure (fourth rib) measured on the CT scans of 12 people: from 8.2 to 52 mL, median 25 mL.

Person	Sex	Age	Volume (mL)
1	Female	77	28
2	Male	58	30
3	Male	62	52
4	Female	41	18
5	Female	58	22
6	Female	93	24
7	Male	73	51
8	Male	9	19
9	Male	33	29
10	Female	21	26
11	Male	15	25
12	Female	5	8.2
Median			25

Fourth rib: volume in real people — 3D models: TotalSegmentator CT dataset v3.0.0, subject s0462: Wasserthal J, Breit H-C, Meyer MT, et al. TotalSegmentator: Robust Segmentation of 104 Anatomic Structures in CT Images. Radiology: Artificial Intelligence 2023;5(5):e230024, https://doi.org/10.1148/ryai.230024; dataset https://doi.org/10.5281/zenodo.22688904, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); surfaces extracted from the segmentation masks and simplified by the 3D Anatomy project.