condition mean min max ZT0-3 10.209620000000001 10.209620000000001 10.209620000000001 ZT4-7 7.29657 7.29657 7.29657 ZT8-11 4.89978 4.89978 4.89978 ZT12-15 7.084205000000001 7.084205000000001 7.084205000000001 ZT16-19 20.8668 20.8668 20.8668 ZT20-23 11.393550000000001 11.393550000000001 11.393550000000001