condition mean min max ZT0-3 13.549 13.549 13.549 ZT4-7 9.505735 9.505735 9.505735 ZT8-11 10.4003 10.4003 10.4003 ZT12-15 11.39635 11.39635 11.39635 ZT16-19 15.022400000000001 15.022400000000001 15.022400000000001 ZT20-23 13.3256 13.3256 13.3256