Table 3. Independent samples t-test for pre-treatment and post-treatment SGRs, with SGRs classified into two groups based on cut-off age values.

Cut-off age	No. (%)	Pre-treatment SGR p value	Post-treatment SGR p value
<60	24 (38.1)	0.56	0.72
>60	39 (61.9)
<65	34 (54.0)	0.83	0.99
>65	29 (46.0)
<70	50 (79.4)	0.75	0.36
>70	13 (20.6)