condition mean min max ZT0-3 39.3478 30.7549 47.9407 ZT4-7 13.77435 13.77435 13.77435 ZT8-11 12.9536 12.9536 12.9536 ZT12-15 0 0 0 ZT16-19 22.06225 22.06225 22.06225 ZT20-23 24.662750000000003 24.662750000000003 24.662750000000003