condition mean min max ZT0-3 6.3031855632500005 5.305904852 7.3004662745 ZT4-7 13.3962267 6.94218102 19.85027238 ZT8-11 22.886409735 21.526645074999998 24.246174395 ZT12-15 10.0761825115 7.0703944735 13.0819705495 ZT16-19 11.4967687755 9.562379121 13.43115843 ZT20-23 14.6496416825 14.01857426 15.280709105