condition mean min max ZT0-3 9276.511915 9276.511915 9276.511915 ZT4-7 10375.476915 10375.476915 10375.476915 ZT8-11 10142.1965055 10142.1965055 10142.1965055 ZT12-15 10853.48288 10853.48288 10853.48288 ZT16-19 9925.4996935 9925.4996935 9925.4996935 ZT20-23 8534.0546425 8534.0546425 8534.0546425