condition mean min max ZT0-3 941.640203 941.640203 941.640203 ZT4-7 687.7319845 687.7319845 687.7319845 ZT8-11 559.752655 559.752655 559.752655 ZT12-15 619.5863145000001 619.5863145000001 619.5863145000001 ZT16-19 527.0751545 527.0751545 527.0751545 ZT20-23 450.6005265 450.6005265 450.6005265