condition mean min max ZT0-3 385.302397 385.302397 385.302397 ZT4-7 718.1673115000001 718.1673115000001 718.1673115000001 ZT8-11 803.402001 803.402001 803.402001 ZT12-15 744.7124375 744.7124375 744.7124375 ZT16-19 546.1959059999999 546.1959059999999 546.1959059999999 ZT20-23 473.6490985 473.6490985 473.6490985