condition mean min max ZT0-3 431.311146 431.311146 431.311146 ZT4-7 436.975464 436.975464 436.975464 ZT8-11 353.012863 353.012863 353.012863 ZT12-15 458.802675 458.802675 458.802675 ZT16-19 357.61215 357.61215 357.61215 ZT20-23 357.373646 357.373646 357.373646