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Table 2: Follow-up imaging results before and after propensity score matching^{^a}
All Cohorts P Value After PSM P Value
Silk Alone (n = 105) SG (n = 22) Silk Alone (n = 24) SG (n = 15)
0- to 3-month follow-up 
    Occlusion^{^b} 36 (60.0) 5 (33.3) .063 7 (41.2) 3 (33.3) >.99
    Residual filling^{^b} 24 (40.0) 10 (66.6) 10 (58.8) 6 (66.6) 
3- to 6-month follow-up 
    Occlusion^{^b} 50 (67.5) 13 (72.2) .703 10 (55.5) 9 (75.0) .440
    Residual filling^{^b} 24 (32.4) 5 (27.7) 8 (44.5) 3 (25.0) 
7- to 12-month follow-up 
    Occlusion^{^b} 61 (75.3) 14 (93.3) .178 13 (65.0) 9 (90.0) .210
    Residual filling^{^b} 20 (24.6) 1 (6.6) 7 (35.0) 1 (10.0) 
>12-month follow-up 
    Occlusion^{^b} 75 (88.2) 15 (93.7) >.99 14 (73.6) 11 (91.6) .363
    Residual filling^{^b} 10 (11.7) 1 (6.2) 5 (26.4) 1 (8.4) 
Note:—PSM indicates propensity score matching.
↵a Data are presented as numbers and percentages.
↵b Count (percentage).