condition mean min max ZT0-3 9.707831 9.707831 9.707831 ZT4-7 10.640847 10.640847 10.640847 ZT8-11 11.1131045 11.1131045 11.1131045 ZT12-15 10.016109499999999 10.016109499999999 10.016109499999999 ZT16-19 10.494975499999999 10.494975499999999 10.494975499999999 ZT20-23 10.1910685 10.1910685 10.1910685