condition mean min max ZT0-3 0.6746188835 0.263829523 1.085408244 ZT4-7 2.990516234 2.439121723 3.541910745 ZT8-11 4.05197013 2.541970094 5.561970166 ZT12-15 10.318804661 8.403190755499999 12.2344185665 ZT16-19 6.801617138999999 6.602147970999999 7.001086307 ZT20-23 8.24417200275 7.5021010245 8.986242981