condition mean min max ZT0-3 11.271725 10.440449999999998 12.103 ZT4-7 12.7202 12.7202 12.7202 ZT8-11 14.8262 14.8262 14.8262 ZT12-15 0 0 0 ZT16-19 15.2656 15.2656 15.2656 ZT20-23 13.68135 13.68135 13.68135