condition mean min max ZT0-3 21.2901 21.2901 21.2901 ZT4-7 16.4309 16.4309 16.4309 ZT8-11 24.1024 24.1024 24.1024 ZT12-15 26.15615 26.15615 26.15615 ZT16-19 33.1481 33.1481 33.1481 ZT20-23 26.017049999999998 26.017049999999998 26.017049999999998