condition mean min max ZT0-3 1088.270518 1088.270518 1088.270518 ZT4-7 1480.3453690000001 1480.3453690000001 1480.3453690000001 ZT8-11 1206.70545 1206.70545 1206.70545 ZT12-15 1206.820443 1206.820443 1206.820443 ZT16-19 1031.823839 1031.823839 1031.823839 ZT20-23 1002.6892455 1002.6892455 1002.6892455