condition mean min max ZT0-3 302.678256 302.678256 302.678256 ZT4-7 275.654913 275.654913 275.654913 ZT8-11 302.4885915 302.4885915 302.4885915 ZT12-15 300.204428 300.204428 300.204428 ZT16-19 325.7585705 325.7585705 325.7585705 ZT20-23 321.637656 321.637656 321.637656