condition mean min max ZT0-3 0.822486942 0.424242446 1.220731438 ZT4-7 1.70650423875 1.3242525845 2.088755893 ZT8-11 2.7809649455 2.3629730195 3.1989568714999996 ZT12-15 3.43087875525 3.10708898 3.7546685305 ZT16-19 2.3839493372500002 2.1289401320000003 2.6389585425 ZT20-23 4.510716306 3.890593429 5.130839183