condition mean min max ZT0-3 96.183276 96.183276 96.183276 ZT4-7 125.385478 125.385478 125.385478 ZT8-11 108.463567 108.463567 108.463567 ZT12-15 74.4183785 74.4183785 74.4183785 ZT16-19 46.698865 46.698865 46.698865 ZT20-23 48.577442500000004 48.577442500000004 48.577442500000004