condition mean min max ZT0-3 563.354894 563.354894 563.354894 ZT4-7 700.6260085 700.6260085 700.6260085 ZT8-11 803.3596365 803.3596365 803.3596365 ZT12-15 663.3369275 663.3369275 663.3369275 ZT16-19 560.4720505 560.4720505 560.4720505 ZT20-23 607.1036369999999 607.1036369999999 607.1036369999999