Pancreatic volume change using three dimensional-computed tomography volumetry and its relationships with diabetes on long-term follow-up in autoimmune pancreatitis

Table 3 Follow-up period and pancreatic volume at initial and last follow-up computed tomography in patients with type-1 autoimmune pancreatitis

Variable	All, n = 33	D-type, n = 16	M-type, n = 17	P valuea
Follow-up period in months	95.8 ± 68.2 (65.0, 19-243)	109.8 ± 74.4 (70, 35-243)	82.6 ± 61.0 (65, 19-212)	0.26
Mean PV at initial CT in cm3	80.4 ± 25.9 (75.8, 36.2-136.0)	84.4 ± 31.4 (86.0, 36.2-136.0)	76.6 ± 19.8 (72.6, 43.9-117.5)	1
Mean relative PV change1 at last follow-up CT as %	37.6 ± 19.3 (32.2, 9.5-82.6)	27.4 ± 11.4 (23.5, 9.5-45.0)	47.1 ± 20.6 (31.0, 18.9-82.6)	0.007
Mean PV at last follow-up CT in cm3	29.0 ± 15.0 (23.2, 10.5-60.3)	22.6 ± 11.1 (19.8, 10.5-47.2)	35.1 ± 15.7 (31.7, 17.8-60.5)	0.013
Mean atrophy ratio of PV at last follow-up CT compared with normal PV as %2	59.3 ± 19.8 (65.5, 53.9-94.0)	68.1 ± 15.1 (69.6, 28.5-86.5)	51.0 ± 20.5 (58.9, 11.5- 77.0)	0.012

Data presented as mean ± standard deviation (median and range).

^aP values between diffuse and mass-forming types.

¹Relative pancreatic volume (PV) change = PV on follow-up computed tomography (CT)/PV on initial CT × 100 %;

²Atrophy ratio of the pancreatic volume (PV) was calculated by dividing the difference in the normal PV and PV at the time of last follow-up computed tomography by the normal PV. CT: Computed tomography; D-type: Diffuse type; M-type: Mass-forming type; PV: Pancreatic volume.