condition mean min max ZT0-3 4.0974225 3.7765050000000002 4.41834 ZT4-7 5.16025 5.16025 5.16025 ZT8-11 6.404805 6.404805 6.404805 ZT12-15 0 0 0 ZT16-19 6.775040000000001 6.775040000000001 6.775040000000001 ZT20-23 4.33746 4.33746 4.33746