condition mean min max ZT0-3 7.00831 6.518395 7.498225 ZT4-7 4.133455 4.133455 4.133455 ZT8-11 4.776355 4.776355 4.776355 ZT12-15 0 0 0 ZT16-19 6.5156 6.5156 6.5156 ZT20-23 8.481435 8.481435 8.481435