condition mean min max ZT0-3 353.104267 353.104267 353.104267 ZT4-7 539.9098235 539.9098235 539.9098235 ZT8-11 522.314688 522.314688 522.314688 ZT12-15 432.7015105 432.7015105 432.7015105 ZT16-19 414.241092 414.241092 414.241092 ZT20-23 383.237492 383.237492 383.237492