condition mean min max ZT0-3 14.908574999999999 14.72715 15.09 ZT4-7 10.064820000000001 10.064820000000001 10.064820000000001 ZT8-11 7.13763 7.13763 7.13763 ZT12-15 0 0 0 ZT16-19 14.59505 14.59505 14.59505 ZT20-23 11.6609 11.6609 11.6609