condition mean min max ZT0-3 420.54999999999995 420.54999999999995 420.54999999999995 ZT4-7 656.1 656.1 656.1 ZT8-11 589.75 589.75 589.75 ZT12-15 534.15 534.15 534.15 ZT16-19 401.55 401.55 401.55 ZT20-23 394.25 394.25 394.25