condition mean min max ZT0-3 16.706699999999998 15.7761 17.6373 ZT4-7 11.107199999999999 11.107199999999999 11.107199999999999 ZT8-11 11.8489 11.8489 11.8489 ZT12-15 0 0 0 ZT16-19 13.95035 13.95035 13.95035 ZT20-23 12.80265 12.80265 12.80265