condition mean min max ZT0-3 21.441174999999998 19.909599999999998 22.972749999999998 ZT4-7 22.8189 22.8189 22.8189 ZT8-11 21.8476 21.8476 21.8476 ZT12-15 0 0 0 ZT16-19 26.2483 26.2483 26.2483 ZT20-23 25.76835 25.76835 25.76835