condition mean min max ZT0-3 2.74648 2.74648 2.74648 ZT4-7 0.5202515 0.5202515 0.5202515 ZT8-11 2.13916 2.13916 2.13916 ZT12-15 10.070174999999999 10.070174999999999 10.070174999999999 ZT16-19 9.27657 9.27657 9.27657 ZT20-23 6.3977 6.3977 6.3977