condition mean min max ZT0-3 8.733195 8.733195 8.733195 ZT4-7 5.907605 5.907605 5.907605 ZT8-11 7.73335 7.73335 7.73335 ZT12-15 8.45679 8.45679 8.45679 ZT16-19 11.65935 11.65935 11.65935 ZT20-23 10.2066 10.2066 10.2066