condition mean min max ZT0-3 0.5057159999999999 0.38761999999999996 0.660268 ZT4-7 0.44783549999999994 0.44783549999999994 0.44783549999999994 ZT8-11 0.2679515 0.2679515 0.2679515 ZT12-15 0.5373365 0.3993225 0.6753505 ZT16-19 0.5837055 0.5837055 0.5837055 ZT20-23 0.5733285 0.5733285 0.5733285