condition mean min max ZT0-3 8.55068 8.55068 8.55068 ZT4-7 6.232075 6.232075 6.232075 ZT8-11 5.848405 5.848405 5.848405 ZT12-15 7.145595 7.145595 7.145595 ZT16-19 12.0359 12.0359 12.0359 ZT20-23 8.234964999999999 8.234964999999999 8.234964999999999