condition mean min max ZT0-3 9.92291 9.92291 9.92291 ZT4-7 8.914882 8.914882 8.914882 ZT8-11 9.951265 9.951265 9.951265 ZT12-15 9.0202905 9.0202905 9.0202905 ZT16-19 7.939273999999999 7.939273999999999 7.939273999999999 ZT20-23 8.5691705 8.5691705 8.5691705