condition mean min max ZT0-3 1.280185 1.280185 1.280185 ZT4-7 0.732885 0.732885 0.732885 ZT8-11 1.21662 1.21662 1.21662 ZT12-15 1.2525249999999999 1.2525249999999999 1.2525249999999999 ZT16-19 1.3774799999999998 1.3774799999999998 1.3774799999999998 ZT20-23 1.12022 1.12022 1.12022