condition mean min max ZT0-3 1099.7424999999998 974.4965 1343.9099999999999 ZT4-7 1130.9465 1130.9465 1130.9465 ZT8-11 1093.6999999999998 1093.6999999999998 1093.6999999999998 ZT12-15 1051.53575 875.5564999999999 1227.5149999999999 ZT16-19 1008.6945000000001 1008.6945000000001 1008.6945000000001 ZT20-23 932.1320000000001 932.1320000000001 932.1320000000001