condition mean min max ZT0-3 1.07758425 0.8229584999999999 1.33221 ZT4-7 1.156634 1.156634 1.156634 ZT8-11 3.03537 3.03537 3.03537 ZT12-15 0 0 0 ZT16-19 2.253695 2.253695 2.253695 ZT20-23 2.07102 2.07102 2.07102