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Figure 1: (a) Kaplan-Meier survival curves for assessing the risk of subsequent hemorrhage. The presence of hemorrhage at the initial presentation carried a significantly increased risk of subsequent hemorrhage compared with an initial nonhemorrhage presentation (P < 0.001, log-rank test); (b) in initial hemorrhage group, comparison of patients in 10-29 and 40-49 age groups with the <10, 30-39 and ≥50 age groups. The annual hemorrhage rate in the patients in the age groups of 10-29 and 40-49 years was higher than that seen in other age groups (P = 0.006, log-rank test); (c) in the non-hemorrhage group, the patients with the intial age <10 years and ≥50 years had a significantly higher risk of a first hemorrhage (P = 0.040, log-rank test); (d) comparison among 232 patients who initially presented with seizures, neurological deficits, headaches or those who were detected to be having an incidental AVM. The annual bleeding rate among patients who initially presented with seizures was significantly lower than that seen in other presentations (P = 0.024, log-rank test)

Figure 1: (a) Kaplan-Meier survival curves for assessing the risk of subsequent hemorrhage. The presence of hemorrhage at the initial presentation carried a significantly increased risk of subsequent hemorrhage compared with an initial nonhemorrhage presentation (<i>P</i> < 0.001, log-rank test); (b) in initial hemorrhage group, comparison of patients in 10-29 and 40-49 age groups with the <10, 30-39 and ≥50 age groups. The annual hemorrhage rate in the patients in the age groups of 10-29 and 40-49 years was higher than that seen in other age groups (<i>P</i> = 0.006, log-rank test); (c) in the non-hemorrhage group, the patients with the intial age <10 years and ≥50 years had a significantly higher risk of a first hemorrhage (<i>P</i> = 0.040, log-rank test); (d) comparison among 232 patients who initially presented with seizures, neurological deficits, headaches or those who were detected to be having an incidental AVM. The annual bleeding rate among patients who initially presented with seizures was significantly lower than that seen in other presentations (<i>P</i> = 0.024, log-rank test)