condition mean min max ZT0-3 22.45715 18.7967 26.1176 ZT4-7 9.66207 9.66207 9.66207 ZT8-11 18.0293 18.0293 18.0293 ZT12-15 0 0 0 ZT16-19 26.34555 26.34555 26.34555 ZT20-23 18.85185 18.85185 18.85185