condition mean min max ZT0-3 5.450699999999999 5.450699999999999 5.450699999999999 ZT4-7 4.8582 4.8582 4.8582 ZT8-11 5.36982 5.36982 5.36982 ZT12-15 5.375954999999999 5.375954999999999 5.375954999999999 ZT16-19 6.19722 6.19722 6.19722 ZT20-23 5.98046 5.98046 5.98046