condition mean min max ZT0-3 15.13495 14.8637 15.4062 ZT4-7 20.85605 20.85605 20.85605 ZT8-11 24.026600000000002 24.026600000000002 24.026600000000002 ZT12-15 0 0 0 ZT16-19 24.5355 24.5355 24.5355 ZT20-23 24.1586 24.1586 24.1586