condition mean min max ZT0-3 51.341282 51.341282 51.341282 ZT4-7 59.235974 59.235974 59.235974 ZT8-11 62.8419915 62.8419915 62.8419915 ZT12-15 75.1584465 75.1584465 75.1584465 ZT16-19 71.0289675 71.0289675 71.0289675 ZT20-23 62.068816999999996 62.068816999999996 62.068816999999996