condition mean min max ZT0-3 21.150575 20.554000000000002 21.747149999999998 ZT4-7 21.698700000000002 21.698700000000002 21.698700000000002 ZT8-11 24.8592 24.8592 24.8592 ZT12-15 0 0 0 ZT16-19 21.938000000000002 21.938000000000002 21.938000000000002 ZT20-23 24.84245 24.84245 24.84245