condition mean min max ZT0-3 8.59235 8.13989 9.04481 ZT4-7 5.7002749999999995 5.7002749999999995 5.7002749999999995 ZT8-11 6.736075 6.736075 6.736075 ZT12-15 0 0 0 ZT16-19 7.706305 7.706305 7.706305 ZT20-23 7.686920000000001 7.686920000000001 7.686920000000001