condition mean min max ZT0-3 159.243332 159.243332 159.243332 ZT4-7 267.1788725 267.1788725 267.1788725 ZT8-11 282.2329395 282.2329395 282.2329395 ZT12-15 258.891773 258.891773 258.891773 ZT16-19 224.484439 224.484439 224.484439 ZT20-23 107.5864385 107.5864385 107.5864385