condition mean min max ZT0-3 49.391400000000004 42.22505 56.55775 ZT4-7 15.36545 15.36545 15.36545 ZT8-11 5.006565 5.006565 5.006565 ZT12-15 0 0 0 ZT16-19 31.04945 31.04945 31.04945 ZT20-23 63.8331 63.8331 63.8331