condition mean min max ZT0-3 699.737495 699.737495 699.737495 ZT4-7 232.24955 232.24955 232.24955 ZT8-11 120.162638 120.162638 120.162638 ZT12-15 136.2001885 136.2001885 136.2001885 ZT16-19 68.7489595 68.7489595 68.7489595 ZT20-23 120.7013315 120.7013315 120.7013315