condition mean min max ZT0-3 9.9503 9.9503 9.9503 ZT4-7 9.17051 9.17051 9.17051 ZT8-11 7.97144 7.97144 7.97144 ZT12-15 7.9066350000000005 7.9066350000000005 7.9066350000000005 ZT16-19 13.59885 13.59885 13.59885 ZT20-23 10.975249999999999 10.975249999999999 10.975249999999999