condition mean min max ZT0-3 29.920817612500002 24.766317305 35.07531792 ZT4-7 5.45116992825 4.494169133 6.4081707235 ZT8-11 6.74049907275 4.6184581 8.8625400455 ZT12-15 11.48762037525 9.2049523305 13.77028842 ZT16-19 11.975758575 11.792723825 12.158793325 ZT20-23 11.8278985125 11.00633648 12.649460545