condition mean min max ZT0-3 44.984058 44.984058 44.984058 ZT4-7 51.096004 51.096004 51.096004 ZT8-11 56.6757835 56.6757835 56.6757835 ZT12-15 63.224523000000005 63.224523000000005 63.224523000000005 ZT16-19 43.393283 43.393283 43.393283 ZT20-23 37.842987 37.842987 37.842987