condition mean min max ZT0-3 194.295912 194.295912 194.295912 ZT4-7 197.2658155 197.2658155 197.2658155 ZT8-11 201.825898 201.825898 201.825898 ZT12-15 261.5422165 261.5422165 261.5422165 ZT16-19 280.7621595 280.7621595 280.7621595 ZT20-23 317.07791199999997 317.07791199999997 317.07791199999997