condition mean min max ZT0-3 216.004504 216.004504 216.004504 ZT4-7 219.755724 219.755724 219.755724 ZT8-11 222.106131 222.106131 222.106131 ZT12-15 195.4013095 195.4013095 195.4013095 ZT16-19 204.388084 204.388084 204.388084 ZT20-23 215.2750565 215.2750565 215.2750565