condition mean min max ZT0-3 30.087249999999997 29.4723 30.702199999999998 ZT4-7 11.832049999999999 11.832049999999999 11.832049999999999 ZT8-11 7.933365 7.933365 7.933365 ZT12-15 0 0 0 ZT16-19 18.0557 18.0557 18.0557 ZT20-23 12.4359 12.4359 12.4359