condition mean min max ZT0-3 0.216786229 0.144957505 0.288614953 ZT4-7 0.55722927125 0.4627978175 0.651660725 ZT8-11 0.9138661302500001 0.595899492 1.2318327685000001 ZT12-15 2.0378993065 1.6577665385 2.4180320745 ZT16-19 1.30806653475 1.136679336 1.4794537335 ZT20-23 2.2644079005 1.819053072 2.7097627290000004