condition mean min max ZT0-3 3.550195 3.550195 3.550195 ZT4-7 2.7068399999999997 2.7068399999999997 2.7068399999999997 ZT8-11 2.9425600000000003 2.9425600000000003 2.9425600000000003 ZT12-15 3.37648 3.37648 3.37648 ZT16-19 4.754835 4.754835 4.754835 ZT20-23 3.843025 3.843025 3.843025