condition mean min max ZT0-3 309.347351 309.347351 309.347351 ZT4-7 374.758956 374.758956 374.758956 ZT8-11 440.4885865 440.4885865 440.4885865 ZT12-15 441.1601685 441.1601685 441.1601685 ZT16-19 380.630296 380.630296 380.630296 ZT20-23 389.4220295 389.4220295 389.4220295