condition mean min max ZT0-3 193.15 193.15 193.15 ZT4-7 142.4 142.4 142.4 ZT8-11 161.5 161.5 161.5 ZT12-15 236.64999999999998 236.64999999999998 236.64999999999998 ZT16-19 227.3 227.3 227.3 ZT20-23 250.5 250.5 250.5