condition mean min max ZT0-3 9.296994999999999 9.296994999999999 9.296994999999999 ZT4-7 6.0816099999999995 6.0816099999999995 6.0816099999999995 ZT8-11 5.304515 5.304515 5.304515 ZT12-15 5.150855 5.150855 5.150855 ZT16-19 9.60107 9.60107 9.60107 ZT20-23 9.51684 9.51684 9.51684