condition mean min max ZT0-3 726.602254 726.602254 726.602254 ZT4-7 551.508519 551.508519 551.508519 ZT8-11 544.7992650000001 544.7992650000001 544.7992650000001 ZT12-15 556.665336 556.665336 556.665336 ZT16-19 522.4122195 522.4122195 522.4122195 ZT20-23 556.389725 556.389725 556.389725