condition mean min max ZT0-3 7.3020375 7.136065 7.46801 ZT4-7 6.75033 6.75033 6.75033 ZT8-11 9.61898 9.61898 9.61898 ZT12-15 0 0 0 ZT16-19 12.419599999999999 12.419599999999999 12.419599999999999 ZT20-23 10.031005 10.031005 10.031005