condition mean min max ZT0-3 5.832823333333334 5.832823333333334 5.832823333333334 ZT4-7 4.964565 4.964565 4.964565 ZT8-11 4.521625 4.521625 4.521625 ZT12-15 4.57457 4.57457 4.57457 ZT16-19 5.93793 5.93793 5.93793 ZT20-23 7.4554599999999995 7.4554599999999995 7.4554599999999995