condition mean min max ZT0-3 16.160119 16.160119 16.160119 ZT4-7 14.705108 14.705108 14.705108 ZT8-11 12.8081455 12.8081455 12.8081455 ZT12-15 12.334332 12.334332 12.334332 ZT16-19 14.218100499999998 14.218100499999998 14.218100499999998 ZT20-23 13.901814 13.901814 13.901814