condition mean min max ZT0-3 242.25 242.25 242.25 ZT4-7 378.8 378.8 378.8 ZT8-11 316.04999999999995 316.04999999999995 316.04999999999995 ZT12-15 275.65 275.65 275.65 ZT16-19 145.70000000000002 145.70000000000002 145.70000000000002 ZT20-23 111.69999999999999 111.69999999999999 111.69999999999999