condition mean min max ZT0-3 195.712071 195.712071 195.712071 ZT4-7 287.6709685 287.6709685 287.6709685 ZT8-11 350.29702199999997 350.29702199999997 350.29702199999997 ZT12-15 273.2201615 273.2201615 273.2201615 ZT16-19 241.49705 241.49705 241.49705 ZT20-23 220.666651 220.666651 220.666651