condition mean min max ZT0-3 5.348398506500001 4.025401942 6.671395071 ZT4-7 1.49580515725 1.214831186 1.7767791284999999 ZT8-11 2.14800823825 1.704764124 2.5912523525 ZT12-15 4.07245188725 3.460019212 4.6848845625 ZT16-19 5.614248923 4.7691386005 6.4593592455 ZT20-23 5.7758222855 5.4741286955 6.0775158755