condition mean min max ZT0-3 10.9262 10.9262 10.9262 ZT4-7 7.140395 7.140395 7.140395 ZT8-11 7.66102 7.66102 7.66102 ZT12-15 11.034735 11.034735 11.034735 ZT16-19 17.526600000000002 17.526600000000002 17.526600000000002 ZT20-23 13.42745 13.42745 13.42745