. 2021 Jun 12;22:536. doi: 10.1186/s12891-021-04411-5

Table 2.

Evaluation of TFCSA/TCSA between diseased segment and non-diseased segment

level	L3/4 stenosis (n=22)	L4/5 stenosis (n=172)	L5/S1 stenosis (n=28)
L3/4	74.33±2.18	76.89±2.81	77.60±2.54
L4/5	77.54±1.72^a	75.51±2.79^a	78.63±2.43^a
L5/S1	77.18±1.75^bc	77.41±2.56^bc	75.49±2.69^bc
P	P^a:0.013;P^b:1.249;P^c:0.025	P^a:0.021;P^b:0.015;P^c:0.9	P^a:0.96;P^b:0.029;P^c:0.038

This table shows the mean TFCSA/TCSA ratios (%) of the L3/4, L4/5, and L5/S1 segments of each group of DLSS case. Columns correspond to groups of cases with stenosis happening in different segments. First three rows correspond to the TFCSA/TCSA ratios (%) of each segment. P < 0.05 was considered to show a statistically significant difference. P, P-value of T-test

^aL4/5 vs L3/4, Student T-test

^bL5/S1 vs L4/5, Student T-test

^cL5/S1 vs L3/4, Student T-test