condition mean min max ZT0-3 252.618386 252.618386 252.618386 ZT4-7 176.59814599999999 176.59814599999999 176.59814599999999 ZT8-11 105.81001 105.81001 105.81001 ZT12-15 132.159369 132.159369 132.159369 ZT16-19 136.96510849999999 136.96510849999999 136.96510849999999 ZT20-23 180.09713 180.09713 180.09713