condition mean min max ZT0-3 11.375209 11.375209 11.375209 ZT4-7 11.906246 11.906246 11.906246 ZT8-11 11.993126 11.993126 11.993126 ZT12-15 12.2864975 12.2864975 12.2864975 ZT16-19 12.136902 12.136902 12.136902 ZT20-23 11.029105000000001 11.029105000000001 11.029105000000001