condition mean min max ZT0-3 24.968344 24.968344 24.968344 ZT4-7 25.917472500000002 25.917472500000002 25.917472500000002 ZT8-11 25.265036000000002 25.265036000000002 25.265036000000002 ZT12-15 21.9121425 21.9121425 21.9121425 ZT16-19 20.9169205 20.9169205 20.9169205 ZT20-23 20.761101500000002 20.761101500000002 20.761101500000002