condition mean min max ZT0-3 6.97625 6.838305 7.1141950000000005 ZT4-7 7.275205000000001 7.275205000000001 7.275205000000001 ZT8-11 10.56545 10.56545 10.56545 ZT12-15 0 0 0 ZT16-19 11.36185 11.36185 11.36185 ZT20-23 10.79165 10.79165 10.79165