condition mean min max ZT0-3 44.066275 38.743449999999996 49.3891 ZT4-7 19.0848 19.0848 19.0848 ZT8-11 12.49565 12.49565 12.49565 ZT12-15 0 0 0 ZT16-19 33.3564 33.3564 33.3564 ZT20-23 39.397149999999996 39.397149999999996 39.397149999999996