condition mean min max ZT0-3 76.647608 76.647608 76.647608 ZT4-7 55.004571999999996 55.004571999999996 55.004571999999996 ZT8-11 57.8817375 57.8817375 57.8817375 ZT12-15 59.96324249999999 59.96324249999999 59.96324249999999 ZT16-19 57.916242999999994 57.916242999999994 57.916242999999994 ZT20-23 58.76844199999999 58.76844199999999 58.76844199999999