condition mean min max ZT0-3 5.025333333333333 4.31225 5.754275 ZT4-7 0.6674880000000001 0.6674880000000001 0.6674880000000001 ZT8-11 1.5699954999999999 1.5699954999999999 1.5699954999999999 ZT12-15 6.527195 5.836015 7.218375 ZT16-19 3.0626249999999997 3.0626249999999997 3.0626249999999997 ZT20-23 4.301285 4.301285 4.301285