condition mean min max ZT0-3 14.34835 13.1153 15.581399999999999 ZT4-7 7.8685 7.8685 7.8685 ZT8-11 8.16234 8.16234 8.16234 ZT12-15 0 0 0 ZT16-19 11.3361 11.3361 11.3361 ZT20-23 10.461839999999999 10.461839999999999 10.461839999999999