condition mean min max ZT0-3 25.788803 25.788803 25.788803 ZT4-7 26.156982499999998 26.156982499999998 26.156982499999998 ZT8-11 23.286544 23.286544 23.286544 ZT12-15 22.483049 22.483049 22.483049 ZT16-19 22.5542115 22.5542115 22.5542115 ZT20-23 20.746539 20.746539 20.746539