condition mean min max ZT0-3 3.8161783784999996 3.385352791 4.247003965999999 ZT4-7 4.981932300333334 4.064050416333333 5.899814184333334 ZT8-11 7.518472000500001 7.307308383333334 7.729635617666667 ZT12-15 7.9394908505 7.633938763000001 8.245042938 ZT16-19 9.661581214666667 9.621995891000001 9.701166538333332 ZT20-23 7.993421415166666 7.935005102333333 8.051837727999999