condition mean min max ZT0-3 12.704777 12.704777 12.704777 ZT4-7 15.72988 15.72988 15.72988 ZT8-11 14.4413125 14.4413125 14.4413125 ZT12-15 13.141147 13.141147 13.141147 ZT16-19 14.6734225 14.6734225 14.6734225 ZT20-23 13.880834499999999 13.880834499999999 13.880834499999999