condition mean min max ZT0-3 16.551646 16.551646 16.551646 ZT4-7 15.111221 15.111221 15.111221 ZT8-11 19.810745 19.810745 19.810745 ZT12-15 17.306813000000002 17.306813000000002 17.306813000000002 ZT16-19 38.4265385 38.4265385 38.4265385 ZT20-23 31.3352335 31.3352335 31.3352335