condition mean min max ZT0-3 0.5264502499999999 0.5212344999999999 0.531666 ZT4-7 1.3373435 1.3373435 1.3373435 ZT8-11 0.48209250000000003 0.48209250000000003 0.48209250000000003 ZT12-15 0 0 0 ZT16-19 0.8885365000000001 0.8885365000000001 0.8885365000000001 ZT20-23 1.0520455 1.0520455 1.0520455