condition mean min max ZT0-3 0.255276 0.255276 0.255276 ZT4-7 0.32417050000000003 0.32417050000000003 0.32417050000000003 ZT8-11 0.46169250000000006 0.46169250000000006 0.46169250000000006 ZT12-15 0.3476215 0.3476215 0.3476215 ZT16-19 0.2829425 0.2829425 0.2829425 ZT20-23 0.2796865 0.2796865 0.2796865