condition mean min max ZT0-3 335.285115 335.285115 335.285115 ZT4-7 232.778832 232.778832 232.778832 ZT8-11 328.9094285 328.9094285 328.9094285 ZT12-15 355.2767135 355.2767135 355.2767135 ZT16-19 353.3130355 353.3130355 353.3130355 ZT20-23 361.7431845 361.7431845 361.7431845