condition mean min max ZT0-3 8.428228 8.428228 8.428228 ZT4-7 8.769951500000001 8.769951500000001 8.769951500000001 ZT8-11 8.854119 8.854119 8.854119 ZT12-15 9.0763815 9.0763815 9.0763815 ZT16-19 8.66395 8.66395 8.66395 ZT20-23 11.439154 11.439154 11.439154