condition mean min max ZT0-3 226.7139 226.7139 226.7139 ZT4-7 182.5293605 182.5293605 182.5293605 ZT8-11 207.756907 207.756907 207.756907 ZT12-15 230.4228935 230.4228935 230.4228935 ZT16-19 207.71898950000002 207.71898950000002 207.71898950000002 ZT20-23 197.390252 197.390252 197.390252