condition mean min max ZT0-3 133.825687 133.825687 133.825687 ZT4-7 125.939566 125.939566 125.939566 ZT8-11 239.40184850000003 239.40184850000003 239.40184850000003 ZT12-15 175.83104250000002 175.83104250000002 175.83104250000002 ZT16-19 107.15693 107.15693 107.15693 ZT20-23 116.122827 116.122827 116.122827