condition mean min max ZT0-3 38.128379 38.128379 38.128379 ZT4-7 28.512133 28.512133 28.512133 ZT8-11 14.3631595 14.3631595 14.3631595 ZT12-15 14.510589 14.510589 14.510589 ZT16-19 21.171098 21.171098 21.171098 ZT20-23 21.856659999999998 21.856659999999998 21.856659999999998