condition mean min max ZT0-3 161.313293 161.313293 161.313293 ZT4-7 65.484464 65.484464 65.484464 ZT8-11 49.892156 49.892156 49.892156 ZT12-15 62.4832725 62.4832725 62.4832725 ZT16-19 33.3120525 33.3120525 33.3120525 ZT20-23 45.345553499999994 45.345553499999994 45.345553499999994