condition mean min max ZT0-3 6.042495000000001 6.042495000000001 6.042495000000001 ZT4-7 6.18152 6.18152 6.18152 ZT8-11 5.5885 5.5885 5.5885 ZT12-15 6.338775 6.338775 6.338775 ZT16-19 7.9469449999999995 7.9469449999999995 7.9469449999999995 ZT20-23 6.006225 6.006225 6.006225