condition mean min max ZT0-3 6.32162 6.32162 6.32162 ZT4-7 5.85604 5.85604 5.85604 ZT8-11 9.506575 9.506575 9.506575 ZT12-15 11.0785 11.0785 11.0785 ZT16-19 7.634029999999999 7.634029999999999 7.634029999999999 ZT20-23 6.254860000000001 6.254860000000001 6.254860000000001