condition mean min max ZT0-3 172.0 172.0 172.0 ZT4-7 294.8 294.8 294.8 ZT8-11 316.9 316.9 316.9 ZT12-15 336.29999999999995 336.29999999999995 336.29999999999995 ZT16-19 354.85 354.85 354.85 ZT20-23 259.25 259.25 259.25