condition mean min max ZT0-3 217.64999999999998 217.64999999999998 217.64999999999998 ZT4-7 218.1 218.1 218.1 ZT8-11 199.2 199.2 199.2 ZT12-15 225.8 225.8 225.8 ZT16-19 236.75 236.75 236.75 ZT20-23 225.79999999999998 225.79999999999998 225.79999999999998