condition mean min max ZT0-3 27.725266666666666 23.6385 32.48575 ZT4-7 23.4658 23.4658 23.4658 ZT8-11 20.2698 20.2698 20.2698 ZT12-15 29.441975 27.530900000000003 31.35305 ZT16-19 26.8647 26.8647 26.8647 ZT20-23 31.332250000000002 31.332250000000002 31.332250000000002