condition mean min max ZT0-3 4.05497 4.05497 4.05497 ZT4-7 4.062275 4.062275 4.062275 ZT8-11 2.02309 2.02309 2.02309 ZT12-15 5.57883 5.57883 5.57883 ZT16-19 8.857095 8.857095 8.857095 ZT20-23 4.686495000000001 4.686495000000001 4.686495000000001