condition mean min max ZT0-3 4.65762 4.65762 4.65762 ZT4-7 2.884035 2.884035 2.884035 ZT8-11 4.316385 4.316385 4.316385 ZT12-15 8.8354 8.8354 8.8354 ZT16-19 9.120975 9.120975 9.120975 ZT20-23 5.4082550000000005 5.4082550000000005 5.4082550000000005