condition mean min max ZT0-3 0.03644465 0.03644465 0.03644465 ZT4-7 0.02536135 0.02536135 0.02536135 ZT8-11 0.08916245 0.08916245 0.08916245 ZT12-15 0.23251349999999998 0.23251349999999998 0.23251349999999998 ZT16-19 0.131607 0.131607 0.131607 ZT20-23 0.03278235 0.03278235 0.03278235