condition mean min max ZT0-3 366.702921 366.702921 366.702921 ZT4-7 305.6399685 305.6399685 305.6399685 ZT8-11 306.266409 306.266409 306.266409 ZT12-15 371.6980155 371.6980155 371.6980155 ZT16-19 403.630477 403.630477 403.630477 ZT20-23 447.636074 447.636074 447.636074