condition mean min max ZT0-3 22.358999 22.358999 22.358999 ZT4-7 25.5450545 25.5450545 25.5450545 ZT8-11 20.608094 20.608094 20.608094 ZT12-15 23.4595775 23.4595775 23.4595775 ZT16-19 25.675399499999997 25.675399499999997 25.675399499999997 ZT20-23 28.0919405 28.0919405 28.0919405