condition mean min max ZT0-3 40.822307 40.822307 40.822307 ZT4-7 57.81344 57.81344 57.81344 ZT8-11 76.421591 76.421591 76.421591 ZT12-15 74.184701 74.184701 74.184701 ZT16-19 74.3360115 74.3360115 74.3360115 ZT20-23 75.89926349999999 75.89926349999999 75.89926349999999