condition mean min max ZT0-3 24.360625000000002 21.062350000000002 27.658900000000003 ZT4-7 6.844564999999999 6.844564999999999 6.844564999999999 ZT8-11 7.513579999999999 7.513579999999999 7.513579999999999 ZT12-15 0 0 0 ZT16-19 18.7226 18.7226 18.7226 ZT20-23 20.2934 20.2934 20.2934