Quantitative DCE-MRI: an efficient diagnostic technique for evaluating early micro-environment permeability changes in ankylosing spondylitis

Table 2 DCE-MRI parameters in the model and control groups at each time point

Time Point	Model Group	Control Group	P	95% Confidence Interval for Difference
K^trans (min ^− 1)
Week 12	0.42 ± 0.02	0.43 ± 0.02	0.736	− 0.024 ~ 0.033
Week 17	0.58 ± 0.03	0.44 ± 0.01	0.000^*	−0.174 ~ − 0.100
Week 22	0.94 ± 0.04	0.44 ± 0.03	0.000^*	−0.552 ~ − 0.446
K_ep (min ⁻¹)
Week 12	1.02 ± 0.06	1.18 ± 0.20	0.143	−0.065 ~ 0.376
Week 17	1.21 ± 0.01	1.18 ± 0.03	0.083	−0.071 ~ 0.005
Week 22	2.39 ± 0.24	1.15 ± 0.04	0.000^*	−1.498 ~ −0.988
V_e
Week 12	0.42 ± 0.02	0.43 ± 0.02	0.656	−0.025 ~ 0.038
Week 17	0.44 ± 0.01	0.44 ± 0.02	0.581	−0.025 ~ 0.015
Week 22	0.49 ± 0.01	0.45 ± 0.01	0.000^*	−0.068 ~ − 0.029

Data are presented as as means±standard deviation. P values for differences between different groups of same time point were determined by independent samples t test.*Statistically significant differences

ISSN: 1471-2474