condition mean min max ZT0-3 5.6881900000000005 5.67964 5.69674 ZT4-7 5.03037 5.03037 5.03037 ZT8-11 4.938385 4.938385 4.938385 ZT12-15 0 0 0 ZT16-19 6.332050000000001 6.332050000000001 6.332050000000001 ZT20-23 6.448145 6.448145 6.448145