condition mean min max ZT0-3 15.996883 15.996883 15.996883 ZT4-7 11.3246885 11.3246885 11.3246885 ZT8-11 10.2420405 10.2420405 10.2420405 ZT12-15 14.2955455 14.2955455 14.2955455 ZT16-19 9.615200999999999 9.615200999999999 9.615200999999999 ZT20-23 11.167319500000001 11.167319500000001 11.167319500000001