condition mean min max ZT0-3 39.058209 39.058209 39.058209 ZT4-7 17.959417 17.959417 17.959417 ZT8-11 19.417565 19.417565 19.417565 ZT12-15 1609.9678675 1609.9678675 1609.9678675 ZT16-19 32.999698 32.999698 32.999698 ZT20-23 1409.551716 1409.551716 1409.551716