condition mean min max ZT0-3 9.99504 8.9671 10.61175 ZT4-7 11.62935 11.62935 11.62935 ZT8-11 12.05345 12.05345 12.05345 ZT12-15 14.671575 14.2745 15.06865 ZT16-19 14.17205 14.17205 14.17205 ZT20-23 15.211450000000001 15.211450000000001 15.211450000000001