condition mean min max ZT0-3 12.142025 11.8971 12.38695 ZT4-7 9.58711 9.58711 9.58711 ZT8-11 9.30462 9.30462 9.30462 ZT12-15 0 0 0 ZT16-19 11.792815000000001 11.792815000000001 11.792815000000001 ZT20-23 10.83885 10.83885 10.83885