condition mean min max ZT0-3 47.7045227075 41.990985755 53.41805966 ZT4-7 10.051842872249999 8.206841643 11.8968441015 ZT8-11 10.902224719 8.2426224655 13.5618269725 ZT12-15 14.3895634285 13.585244442 15.193882415 ZT16-19 18.3147659 15.19465663 21.43487517 ZT20-23 31.72853629 31.639871839999998 31.81720074