condition mean min max ZT0-3 74.280588 74.280588 74.280588 ZT4-7 97.9075385 97.9075385 97.9075385 ZT8-11 92.4345165 92.4345165 92.4345165 ZT12-15 79.02870899999999 79.02870899999999 79.02870899999999 ZT16-19 71.325216 71.325216 71.325216 ZT20-23 66.4732685 66.4732685 66.4732685