condition mean min max ZT0-3 0.485746 0.485746 0.485746 ZT4-7 0.5030509999999999 0.5030509999999999 0.5030509999999999 ZT8-11 0.4935935 0.4935935 0.4935935 ZT12-15 0.307498 0.307498 0.307498 ZT16-19 0.747718 0.747718 0.747718 ZT20-23 0.48946599999999996 0.48946599999999996 0.48946599999999996