condition mean min max ZT0-3 10.502378754 9.255968188 11.74878932 ZT4-7 4.4458584622499995 4.2207567225 4.670960202 ZT8-11 3.2913729242499996 3.2858257029999995 3.2969201454999997 ZT12-15 2.99765523175 2.6877039695000002 3.307606494 ZT16-19 4.007995628 3.227302373 4.788688883 ZT20-23 8.62769492575 7.87787816 9.3775116915