condition mean min max ZT0-3 7.0916575 6.667975 7.51534 ZT4-7 6.102715 6.102715 6.102715 ZT8-11 5.80462 5.80462 5.80462 ZT12-15 0 0 0 ZT16-19 4.903205 4.903205 4.903205 ZT20-23 7.179399999999999 7.179399999999999 7.179399999999999