condition mean min max ZT0-3 42.327542 42.327542 42.327542 ZT4-7 27.9526495 27.9526495 27.9526495 ZT8-11 24.9856605 24.9856605 24.9856605 ZT12-15 32.0939155 32.0939155 32.0939155 ZT16-19 27.505792 27.505792 27.505792 ZT20-23 22.181402 22.181402 22.181402