condition mean min max ZT0-3 5.980124999999999 5.3693349999999995 6.590915 ZT4-7 3.28924 3.28924 3.28924 ZT8-11 6.98138 6.98138 6.98138 ZT12-15 0 0 0 ZT16-19 6.4009 6.4009 6.4009 ZT20-23 5.30248 5.30248 5.30248