condition mean min max ZT0-3 4.4007175 4.05124 4.750195 ZT4-7 6.26065 6.26065 6.26065 ZT8-11 10.5534 10.5534 10.5534 ZT12-15 0 0 0 ZT16-19 9.59887 9.59887 9.59887 ZT20-23 6.82604 6.82604 6.82604