condition mean min max ZT0-3 27.85565 26.9244 28.786900000000003 ZT4-7 26.346249999999998 26.346249999999998 26.346249999999998 ZT8-11 39.29255 39.29255 39.29255 ZT12-15 0 0 0 ZT16-19 56.53375 56.53375 56.53375 ZT20-23 48.2571 48.2571 48.2571