condition mean min max ZT0-3 2.3593047895 2.215168233 2.503441346 ZT4-7 2.47737821125 1.658014091 3.2967423315 ZT8-11 4.34125678225 2.617685046 6.064828518500001 ZT12-15 8.66973942025 7.9467510295 9.392727811 ZT16-19 6.152504028499999 5.730771690999999 6.574236365999999 ZT20-23 6.23410782675 5.3846364135 7.083579240000001