condition mean min max ZT0-3 0.0758705835 0.0 0.151741167 ZT4-7 0.03437340275 0.0 0.0687468055 ZT8-11 0.12819107175 0.0 0.2563821435 ZT12-15 1.950154998 1.50432328 2.395986716 ZT16-19 1.0003188765 0.7791708135 1.2214669395 ZT20-23 0.23557575900000002 0.107573166 0.36357835200000005