condition mean min max ZT0-3 24.5905 24.5905 24.5905 ZT4-7 17.18155 17.18155 17.18155 ZT8-11 11.38335 11.38335 11.38335 ZT12-15 15.27315 15.27315 15.27315 ZT16-19 19.02145 19.02145 19.02145 ZT20-23 19.3955 19.3955 19.3955