condition mean min max ZT0-3 2.379675 1.891955 2.867395 ZT4-7 0.898137 0.898137 0.898137 ZT8-11 0.9011965 0.9011965 0.9011965 ZT12-15 0 0 0 ZT16-19 1.2442945 1.2442945 1.2442945 ZT20-23 1.7496 1.7496 1.7496