condition mean min max ZT0-3 0.21789114999999998 0.19597579999999998 0.2398065 ZT4-7 0.3583955 0.3583955 0.3583955 ZT8-11 0.23825254999999998 0.23825254999999998 0.23825254999999998 ZT12-15 0 0 0 ZT16-19 0.8650755000000001 0.8650755000000001 0.8650755000000001 ZT20-23 0.3553845 0.3553845 0.3553845