condition mean min max ZT0-3 403.040902 403.040902 403.040902 ZT4-7 351.7260205 351.7260205 351.7260205 ZT8-11 129.0684345 129.0684345 129.0684345 ZT12-15 81.935058 81.935058 81.935058 ZT16-19 237.9976 237.9976 237.9976 ZT20-23 306.105889 306.105889 306.105889