condition mean min max ZT0-3 11.895399999999999 11.895399999999999 11.895399999999999 ZT4-7 7.72654 7.72654 7.72654 ZT8-11 9.892705 9.892705 9.892705 ZT12-15 14.616900000000001 14.616900000000001 14.616900000000001 ZT16-19 17.259900000000002 17.259900000000002 17.259900000000002 ZT20-23 14.72795 14.72795 14.72795