condition mean min max ZT0-3 11.956761 11.956761 11.956761 ZT4-7 11.317846 11.317846 11.317846 ZT8-11 10.1041065 10.1041065 10.1041065 ZT12-15 9.964768 9.964768 9.964768 ZT16-19 10.2192045 10.2192045 10.2192045 ZT20-23 11.631854 11.631854 11.631854