condition mean min max ZT0-3 93.385148 93.385148 93.385148 ZT4-7 66.8020405 66.8020405 66.8020405 ZT8-11 56.0774995 56.0774995 56.0774995 ZT12-15 72.9058735 72.9058735 72.9058735 ZT16-19 76.0068025 76.0068025 76.0068025 ZT20-23 71.129022 71.129022 71.129022