condition mean min max ZT0-3 3341.7 3341.7 3341.7 ZT4-7 3512.1 3512.1 3512.1 ZT8-11 3179.8999999999996 3179.8999999999996 3179.8999999999996 ZT12-15 3438.95 3438.95 3438.95 ZT16-19 4041.2999999999997 4041.2999999999997 4041.2999999999997 ZT20-23 3415.05 3415.05 3415.05