condition mean min max ZT0-3 52.842113145 50.64417734999999 55.04004894 ZT4-7 50.335190651666665 50.209124276666664 50.461257026666665 ZT8-11 54.29534884500001 54.13846432333334 54.45223336666667 ZT12-15 50.929186395 49.90651763666666 51.951855153333334 ZT16-19 57.33512206 55.27782674 59.39241738 ZT20-23 64.63565986500001 62.36986198 66.90145775