condition mean min max ZT0-3 315.815876 315.815876 315.815876 ZT4-7 291.14067450000005 291.14067450000005 291.14067450000005 ZT8-11 322.2371255 322.2371255 322.2371255 ZT12-15 365.972504 365.972504 365.972504 ZT16-19 434.316641 434.316641 434.316641 ZT20-23 394.6977095 394.6977095 394.6977095