condition mean min max ZT0-3 13.065225 13.062149999999999 13.0683 ZT4-7 9.73788 9.73788 9.73788 ZT8-11 8.185085 8.185085 8.185085 ZT12-15 0 0 0 ZT16-19 11.350249999999999 11.350249999999999 11.350249999999999 ZT20-23 11.035699999999999 11.035699999999999 11.035699999999999