condition mean min max ZT0-3 1.8582925000000001 1.469625 2.24696 ZT4-7 1.1451825 1.1451825 1.1451825 ZT8-11 1.480385 1.480385 1.480385 ZT12-15 0 0 0 ZT16-19 4.1390199999999995 4.1390199999999995 4.1390199999999995 ZT20-23 4.777245 4.777245 4.777245