condition mean min max ZT0-3 6.3143 5.509705 7.118895 ZT4-7 4.7625399999999996 4.7625399999999996 4.7625399999999996 ZT8-11 6.202565 6.202565 6.202565 ZT12-15 0 0 0 ZT16-19 7.62284 7.62284 7.62284 ZT20-23 7.6400500000000005 7.6400500000000005 7.6400500000000005