condition mean min max ZT0-3 0.42483400000000004 0.42483400000000004 0.42483400000000004 ZT4-7 0.23926050000000001 0.23926050000000001 0.23926050000000001 ZT8-11 0.151941 0.151941 0.151941 ZT12-15 0.18454949999999998 0.18454949999999998 0.18454949999999998 ZT16-19 0.6250175 0.6250175 0.6250175 ZT20-23 0.48399400000000004 0.48399400000000004 0.48399400000000004