condition mean min max ZT0-3 56.524807 56.524807 56.524807 ZT4-7 46.3524675 46.3524675 46.3524675 ZT8-11 61.465507 61.465507 61.465507 ZT12-15 60.71329 60.71329 60.71329 ZT16-19 71.48811 71.48811 71.48811 ZT20-23 64.844783 64.844783 64.844783