condition mean min max ZT0-3 2.534082389 1.576013115 3.492151663 ZT4-7 3.17018893125 1.4738223085 4.866555554 ZT8-11 13.30785652825 9.6218915615 16.993821495 ZT12-15 14.55799043125 14.43847774 14.6775031225 ZT16-19 6.87198984525 5.798000102 7.9459795885 ZT20-23 4.70111048375 4.6541168045 4.748104163000001