condition mean min max ZT0-3 38.514988 38.514988 38.514988 ZT4-7 38.3105675 38.3105675 38.3105675 ZT8-11 39.5805015 39.5805015 39.5805015 ZT12-15 45.9594825 45.9594825 45.9594825 ZT16-19 41.7523635 41.7523635 41.7523635 ZT20-23 38.912358 38.912358 38.912358