condition mean min max ZT0-3 8.010277 8.010277 8.010277 ZT4-7 8.285923499999999 8.285923499999999 8.285923499999999 ZT8-11 7.141563 7.141563 7.141563 ZT12-15 7.724231 7.724231 7.724231 ZT16-19 7.6423000000000005 7.6423000000000005 7.6423000000000005 ZT20-23 7.807236 7.807236 7.807236