condition mean min max ZT0-3 10.50998 9.630410000000001 11.38955 ZT4-7 8.86571 8.86571 8.86571 ZT8-11 6.758165 6.758165 6.758165 ZT12-15 0 0 0 ZT16-19 9.857705 9.857705 9.857705 ZT20-23 9.770859999999999 9.770859999999999 9.770859999999999