condition mean min max ZT0-3 6.99964 5.2983899999999995 8.700890000000001 ZT4-7 6.3378499999999995 6.3378499999999995 6.3378499999999995 ZT8-11 7.098050000000001 7.098050000000001 7.098050000000001 ZT12-15 0 0 0 ZT16-19 10.912385 10.912385 10.912385 ZT20-23 7.22245 7.22245 7.22245