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Comparing rate of shuntinfection by the number of shunt surgery and AIS vs non-AIS
| No. of shunt surgery | No shuntinfection | Shuntinfection | N | |
| 1 | non-AIS | 58 (100 %) | 0 (0 %) | 58 |
| 1 | AIS | 34 (100 %) | 0 (0 %) | 34 |
| 2 or more | non-AIS | 104 (91.23 %) | 10 (8.77 %) | 114 |
| 2 or more | AIS | 47 (90.38 %) | 5 (9.62 %) | 52 |
| n | 243 | 15 | 258 |
AIS does not differ from non-AIS (p = 0.8611) but No. of shunt surgery >1 differs significantly from No. = 1 (p = 0.0002); (multiple logistic regression)
