condition mean min max ZT0-3 4.1387775 3.75149 4.526065 ZT4-7 3.94677 3.94677 3.94677 ZT8-11 5.84432 5.84432 5.84432 ZT12-15 0 0 0 ZT16-19 4.21617 4.21617 4.21617 ZT20-23 4.34968 4.34968 4.34968