condition mean min max ZT0-3 11.3432625 10.559574999999999 12.12695 ZT4-7 10.8656 10.8656 10.8656 ZT8-11 12.55585 12.55585 12.55585 ZT12-15 0 0 0 ZT16-19 15.4271 15.4271 15.4271 ZT20-23 14.08035 14.08035 14.08035