condition mean min max ZT0-3 24.505022 24.505022 24.505022 ZT4-7 28.4304865 28.4304865 28.4304865 ZT8-11 28.305948 28.305948 28.305948 ZT12-15 27.9238625 27.9238625 27.9238625 ZT16-19 25.6305465 25.6305465 25.6305465 ZT20-23 25.0221095 25.0221095 25.0221095