condition mean min max ZT0-3 14.149149999999999 13.62145 14.67685 ZT4-7 9.6923 9.6923 9.6923 ZT8-11 5.589169999999999 5.589169999999999 5.589169999999999 ZT12-15 0 0 0 ZT16-19 9.752434999999998 9.752434999999998 9.752434999999998 ZT20-23 10.72925 10.72925 10.72925