condition mean min max ZT0-3 15.074950000000001 14.787400000000002 15.3625 ZT4-7 17.8917 17.8917 17.8917 ZT8-11 11.708300000000001 11.708300000000001 11.708300000000001 ZT12-15 0 0 0 ZT16-19 17.170749999999998 17.170749999999998 17.170749999999998 ZT20-23 18.80435 18.80435 18.80435