Independent variable | Assignment method |
Pathological type | 0 = non-leukemia; 1 = leukemia |
Complication | 0 = NO; 1 = YES |
Number of puncturing times | 0 = 1 times; 1 ≥ 1 times |
Positioning method | 0 = ECG positioning; 1 = chest radiography positioning |
Maintenance frequency | 0 ≥ 1 (times/week); 1 = 0 (times/week) |
Maintenance place | 0 = in-hospital maintenance; 1 = out-of-hospital maintenance |