condition mean min max ZT0-3 1555.253861 1555.253861 1555.253861 ZT4-7 1398.776229 1398.776229 1398.776229 ZT8-11 1764.1454910000002 1764.1454910000002 1764.1454910000002 ZT12-15 2197.1609774999997 2197.1609774999997 2197.1609774999997 ZT16-19 1737.222276 1737.222276 1737.222276 ZT20-23 1169.8884965 1169.8884965 1169.8884965