condition mean min max ZT0-3 9.244174999999998 8.61338 9.87497 ZT4-7 5.27876 5.27876 5.27876 ZT8-11 5.73798 5.73798 5.73798 ZT12-15 0 0 0 ZT16-19 10.034175 10.034175 10.034175 ZT20-23 9.80948 9.80948 9.80948