condition mean min max ZT0-3 25.862415 25.862415 25.862415 ZT4-7 18.845122500000002 18.845122500000002 18.845122500000002 ZT8-11 17.329648499999998 17.329648499999998 17.329648499999998 ZT12-15 16.0536495 16.0536495 16.0536495 ZT16-19 18.798041 18.798041 18.798041 ZT20-23 21.255392999999998 21.255392999999998 21.255392999999998