condition mean min max ZT0-3 107.244624 107.244624 107.244624 ZT4-7 142.41537 142.41537 142.41537 ZT8-11 201.70455550000003 201.70455550000003 201.70455550000003 ZT12-15 243.44870199999997 243.44870199999997 243.44870199999997 ZT16-19 263.551056 263.551056 263.551056 ZT20-23 185.3334355 185.3334355 185.3334355