condition mean min max ZT0-3 158.555113 158.555113 158.555113 ZT4-7 147.6231235 147.6231235 147.6231235 ZT8-11 164.737493 164.737493 164.737493 ZT12-15 167.8908285 167.8908285 167.8908285 ZT16-19 237.7342775 237.7342775 237.7342775 ZT20-23 240.2131395 240.2131395 240.2131395