condition mean min max ZT0-3 231.72899999999998 231.72899999999998 231.72899999999998 ZT4-7 196.2135 196.2135 196.2135 ZT8-11 182.2335 182.2335 182.2335 ZT12-15 184.5235 184.5235 184.5235 ZT16-19 246.18349999999998 246.18349999999998 246.18349999999998 ZT20-23 269.098 269.098 269.098