condition mean min max ZT0-3 18.5042601675 16.986720335 20.0218 ZT4-7 8.406285266000001 7.8926754505000005 8.9198950815 ZT8-11 9.6066976145 7.198927828 12.014467401000001 ZT12-15 12.364140435 12.013694485 12.714586385 ZT16-19 12.697491912499999 12.654794594999998 12.74018923 ZT20-23 12.39725377575 11.2204232865 13.574084265