condition mean min max ZT0-3 17.3465 17.3465 17.3465 ZT4-7 14.50305 14.50305 14.50305 ZT8-11 14.41585 14.41585 14.41585 ZT12-15 18.9051 18.9051 18.9051 ZT16-19 20.47205 20.47205 20.47205 ZT20-23 17.4099 17.4099 17.4099