condition mean min max ZT0-3 11.852425 11.3708 12.33405 ZT4-7 17.67555 17.67555 17.67555 ZT8-11 8.51047 8.51047 8.51047 ZT12-15 0 0 0 ZT16-19 6.4185300000000005 6.4185300000000005 6.4185300000000005 ZT20-23 11.95885 11.95885 11.95885