condition mean min max ZT0-3 10.315999999999999 10.315999999999999 10.315999999999999 ZT4-7 12.5241 12.5241 12.5241 ZT8-11 11.37215 11.37215 11.37215 ZT12-15 13.216000000000001 13.216000000000001 13.216000000000001 ZT16-19 9.748349999999999 9.748349999999999 9.748349999999999 ZT20-23 11.76265 11.76265 11.76265