condition mean min max ZT0-3 1.53885 1.53885 1.53885 ZT4-7 1.1300335000000001 1.1300335000000001 1.1300335000000001 ZT8-11 1.98658 1.98658 1.98658 ZT12-15 1.96776 1.96776 1.96776 ZT16-19 2.366975 2.366975 2.366975 ZT20-23 1.26267 1.26267 1.26267