condition mean min max ZT0-3 2.6641576469999997 1.079844957 4.248470337 ZT4-7 8.27852848275 7.9083624095000005 8.648694555999999 ZT8-11 12.40034252225 10.42172771 14.378957334499999 ZT12-15 14.02490207875 11.8498346075 16.19996955 ZT16-19 7.83857499425 7.2670107875 8.410139201 ZT20-23 9.2024102345 7.305536071000001 11.099284398