condition mean min max ZT0-3 2.15727 2.15727 2.15727 ZT4-7 0.627075 0.627075 0.627075 ZT8-11 0.685745 0.685745 0.685745 ZT12-15 1.658965 1.658965 1.658965 ZT16-19 2.2021100000000002 2.2021100000000002 2.2021100000000002 ZT20-23 1.6337800000000002 1.6337800000000002 1.6337800000000002