condition mean min max ZT0-3 368.087842 368.087842 368.087842 ZT4-7 379.2599295 379.2599295 379.2599295 ZT8-11 409.925634 409.925634 409.925634 ZT12-15 384.4155045 384.4155045 384.4155045 ZT16-19 541.4969845 541.4969845 541.4969845 ZT20-23 571.132563 571.132563 571.132563