condition mean min max ZT0-3 7.16386 6.63244 7.6952799999999995 ZT4-7 4.72114 4.72114 4.72114 ZT8-11 4.962680000000001 4.962680000000001 4.962680000000001 ZT12-15 0 0 0 ZT16-19 6.80824 6.80824 6.80824 ZT20-23 5.224959999999999 5.224959999999999 5.224959999999999