condition mean min max ZT0-3 489.521 489.521 489.521 ZT4-7 537.8164999999999 537.8164999999999 537.8164999999999 ZT8-11 291.707 291.707 291.707 ZT12-15 132.32850000000002 132.32850000000002 132.32850000000002 ZT16-19 209.14499999999998 209.14499999999998 209.14499999999998 ZT20-23 359.931 359.931 359.931