condition mean min max ZT0-3 4.268 4.268 4.268 ZT4-7 2.981595 2.981595 2.981595 ZT8-11 2.475745 2.475745 2.475745 ZT12-15 2.63258 2.63258 2.63258 ZT16-19 5.001155000000001 5.001155000000001 5.001155000000001 ZT20-23 4.522715 4.522715 4.522715