condition mean min max ZT0-3 3.62712 2.6962099999999998 4.82594 ZT4-7 1.70412 1.70412 1.70412 ZT8-11 2.27678 2.27678 2.27678 ZT12-15 1.9848375 1.3451 2.624575 ZT16-19 1.766605 1.766605 1.766605 ZT20-23 2.1722099999999998 2.1722099999999998 2.1722099999999998