condition mean min max ZT0-3 11.47045 11.47045 11.47045 ZT4-7 11.247 11.247 11.247 ZT8-11 7.442715 7.442715 7.442715 ZT12-15 4.971970000000001 4.971970000000001 4.971970000000001 ZT16-19 8.018965 8.018965 8.018965 ZT20-23 9.275045 9.275045 9.275045