condition mean min max ZT0-3 339.79999999999995 339.79999999999995 339.79999999999995 ZT4-7 200.6 200.6 200.6 ZT8-11 192.75 192.75 192.75 ZT12-15 156.7 156.7 156.7 ZT16-19 184.9 184.9 184.9 ZT20-23 275.75 275.75 275.75