condition mean min max ZT0-3 10.9327675 9.581235 12.2843 ZT4-7 5.0806000000000004 5.0806000000000004 5.0806000000000004 ZT8-11 2.38211 2.38211 2.38211 ZT12-15 0 0 0 ZT16-19 6.24589 6.24589 6.24589 ZT20-23 6.070015 6.070015 6.070015