condition mean min max ZT0-3 6.074005 5.2966999999999995 6.85131 ZT4-7 5.38341 5.38341 5.38341 ZT8-11 13.754249999999999 13.754249999999999 13.754249999999999 ZT12-15 0 0 0 ZT16-19 8.65886 8.65886 8.65886 ZT20-23 7.741294999999999 7.741294999999999 7.741294999999999