condition mean min max ZT0-3 146.070305 146.070305 146.070305 ZT4-7 191.785411 191.785411 191.785411 ZT8-11 198.6257555 198.6257555 198.6257555 ZT12-15 204.82681 204.82681 204.82681 ZT16-19 150.2208005 150.2208005 150.2208005 ZT20-23 112.469266 112.469266 112.469266