condition mean min max ZT0-3 634.995745 634.995745 634.995745 ZT4-7 737.6129455 737.6129455 737.6129455 ZT8-11 804.9996965 804.9996965 804.9996965 ZT12-15 890.4536284999999 890.4536284999999 890.4536284999999 ZT16-19 1210.8731914999998 1210.8731914999998 1210.8731914999998 ZT20-23 1102.637363 1102.637363 1102.637363