condition mean min max ZT0-3 0.518595 0.298671 0.738519 ZT4-7 0.446237 0.446237 0.446237 ZT8-11 0.147613 0.147613 0.147613 ZT12-15 0 0 0 ZT16-19 0.587301 0.587301 0.587301 ZT20-23 0.2963685 0.2963685 0.2963685