condition mean min max ZT0-3 11.609200000000001 11.32005 11.89835 ZT4-7 12.39715 12.39715 12.39715 ZT8-11 11.602699999999999 11.602699999999999 11.602699999999999 ZT12-15 0 0 0 ZT16-19 10.19276 10.19276 10.19276 ZT20-23 10.139230000000001 10.139230000000001 10.139230000000001