condition mean min max ZT0-3 18.5807 18.5807 18.5807 ZT4-7 16.271349999999998 16.271349999999998 16.271349999999998 ZT8-11 17.112299999999998 17.112299999999998 17.112299999999998 ZT12-15 17.47005 17.47005 17.47005 ZT16-19 20.0937 20.0937 20.0937 ZT20-23 16.949849999999998 16.949849999999998 16.949849999999998