condition mean min max ZT0-3 3030.3 3030.3 3030.3 ZT4-7 4216.0 4216.0 4216.0 ZT8-11 3173.55 3173.55 3173.55 ZT12-15 3081.45 3081.45 3081.45 ZT16-19 3435.1499999999996 3435.1499999999996 3435.1499999999996 ZT20-23 3096.95 3096.95 3096.95