condition mean min max ZT0-3 334.479649 334.479649 334.479649 ZT4-7 297.472306 297.472306 297.472306 ZT8-11 310.643017 310.643017 310.643017 ZT12-15 387.28641200000004 387.28641200000004 387.28641200000004 ZT16-19 414.356171 414.356171 414.356171 ZT20-23 398.4695755 398.4695755 398.4695755